Basically all VV mods do the same thing and all VW mods do the same thing.
Which one to get comes down to user preference for looks/size and build quality.
While the quality of vape (flavour/vapour production/throat hit) is effected by the mod you use most of that is down to the coil/wick setup, the mod will vape a little differently depending on the way it uses it's electronics to fire the coils (RMS or flat type signal) in practice though it doesn't make a huge difference.
If you want the cheapest option then the best way is to use a co-op or a group buy where a lot of people get together and buy an item in bulk direct from China. The 2nd best option is to use something like fasttech. Both of those options will leave you waiting 2weeks+ for your vapemail to arrive and you will have little to no warranty if anything goes wrong (a group buy might give you a little help) returning faulty items to China is 'difficult'.
If you want stuff faster and want to have some warranty if things go wrong then there are lots of UK vendors who you can choose from and the extra in the prices you pay from a UK or EU vendor mostly come down to paying VAT, providing warranty on stuff and making sure things sold in the UK are safe.
(prices quoted here are rough guesstimate of UK prices)
For a VV type device now for around £30 you have the choice of an eGo Twist/Vision spinner type of device. These are more portable because they are slimmer, though they only do VV. The downside to these devices mostly is that the battery and the device is all-in-one. So when it runs out you can't stick a different battery inside you have to charge the whole thing, so you'll need 2 of them (or a n other backup device for while it's charging)
the build quality is OK and for the price you pay they're pretty good. I'd recommend using atomisers inthe 1.8Ohm range to go with these as you'll be able to get more power range. The biggest minus for these is the lack of resistance testing, you need to adjust them 'to taste' and it's easier to burn a coil and then have to clean it to get rid of burnt taste if you overpower it by mistake.
Next up in the ladder is a Vamo. A Vamo kit will set you back about £40. Build quality on these is reasonable for the price you pay. These can be more portable because you can run them in 18350 mode which makes them shorter (18350 batteries will set you back an extra few quid, they come normally with 18650's) If you want to carry your device around with you a lot portability can matter, which do you prefer shorter and fatter or longer and thinner? <insert smiley="" of="" your="" choice="" here=""> the Vamo gives you 2 things that previous devices don't Variable Wattage and 'telescoping' of a kind. Basically you can run a vamo with or without an extension tube so you have the flexibility to make it shorter or longer. Essentially the bigger the battery in the device the longer it'll last between charges. Also running stacked batteries can help with regulation as if you like to vape at over 4v settings then it's easier for the devices and provides a more consistent vape for something to reduce the ~8v coming from 2 batteries into 4v+ than it is to get a single battery providing ~3.8v to step up to 4v+. (*note* if you're running stacked batteries it's a really good idea to use good quality batteries such as AW IMR or Efest IMR, cheap, stacked, unprotected batteries are a little risky)
Variable wattage is an excellent thing. It allows you to set the power level you like and the device figures out the correct voltage for you, and can even adjust voltage on the fly. (when coils get hot during use their resistance can change) The biggest plus for VW devices is that they allow you to screw on any resistance carto/tank/ whatever without you needing to fiddle with the power settings to get the vape you want. If you often change tanks or if you might well get a few cartos attys whatever with different flavour juices in them all ready to go then VW is really *really* useful. The other really good thing VW does is it eliminates accidental coil burning for the most part. If your tobacco juice is in a 3ohm carto say and you have your VV device dialled up to give you 8watts of power at ~4.9v and then you put your Watermelon juice on for a change and you have that on a 1.8ohm coil and don't realise a pure VV device might end up burning your 1.8ohm coil whereas a VW device will dial down the voltage for you and keep your vape at 8watts automagically.
Next up is an Innokin SVD. This is around £60 for a kit. It's build quality is a step above Vamos it's stainless steel and heavier. The advantage it brings is proper telescoping giving you the biggest range in length and lets you use pretty much any battery config you like. It does all the stuff the Vamo does, but the build quality means it'll last a lot longer than a Vamo will. An SVD has slightly more options on the top cap meaning you can screw just about anything onto it with a 510/ego type connection.
Next up is a Sigelei ZMax kit For around £70 for the kit. The biggest advantage this one has is the screen. It's has an OLED screen which is much easier to read and to understand than the 3 digit LCD type screens you'll find on most other mods. It doesn't do telescoping and it's a set size. (you can now get a Zmax v3 or a 'TeleMax' though these are more expensive £70 for the device only) It does do 18650 or stacked 18350 batteries.
I've been using a ZMax v2 for the past 3 months or so and it's really good imo. It's stainless steel and as hefty as an SVD is and it has a top cap like the SVD that lets you screw almost anything onto it. There is also a Smoktech ZMax just to confuse things, that uses the same electronics inside as the Sigelei does, but it has a 3 digit LED screen. Aside from that the Smoktech version and the Sigelei version are more or less identical.
Then finally there is a HUGE price jump to a Provari. Those are around £200 for a kit. The build quality on these is 2nd to none. The price you pay for one though is very high compared to a ZMax or an SVD which do exactly the same things. The quality control on Provaris is basically what you are paying for. Provape have a fixed price structure so that you cannot sell them for less than their RRP, which is another reason they are so expensive as vendors can't do discounts on them so much. On the flipside they will last for a long time and they hold their value so you can get a good chunk of your cash back if you want to sell your later. Vape wise there is very very little to choose between vape quality between a Provari or an SVD or a ZMax running the same atomiser at the same settings (yes I have had all 3 next to each other and tried this out
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you pays yer monies, you makes yer choice basically.
Personally I'd spend some money on a mid range device. There are 2 major paths in vaping atm. Mechanical mods running low resistance Genesis RBAs. VW mods for ease of use and convenience. If you shell out the money for a Provari and then decide later that you prefer the mechs then you're out £200 and have to take the time to sell it perhaps. An SVD or a ZMax will last ages and which to choose between the 2 of them comes down to looks mostly, or the screen they use.
If your funds are tight and you want an inexpensive look at VW/VV vaping then get a Vamo. Expect to have to replace it ~6months later as it'll likely break. Though if you want a cheaper route into VV/VW stuff a Vamo does everything a Provari does, just not quite as well, for a fraction of the cost.
If moneys not an issue then just get a Provari. They are excellent bits of kit and they hold their value.
I'd recommend watching the PBusardo vids on any of the devices you are thinking about and go from there.
Hope this helped. Happy Vaping.</insert>
