I've had a Vamo V5 for the last month. It performs well, and I'm happy from that perspective, but I'm not entirely convinced about build quality. Already the oled cover has cracked, and I've had to use part of a PET eliquid bottle to glue on to cover the square hole. The covers can be had from stealthvaper for a couple of quid and easy to replace, but I figure if the first one was crap, why would a replacement be any different? The chrome is also rapidly wearing off the edge at the bottom of the device, so I would say go for the stainless version, only another £5 from myepack if you are going down the Vamo road.
As I understand it, both Vamo and SVD both use the same electronic control internals, so both are going to offer the same facilities. I've heard the the tank sits flush on a SVD, whereas there is a gap on the Vamo for airflow, which doesn't bother me personally.
I carry the Vamo [in 18350 mode] around with me everywhere and I'm happy with the vape, but when it dies I would replace it with a SVD because the build quality looks to be slightly better.
Hope this helps.