Iv found it can vary greatly. Smok, Smok was the joke name and brunt of jokes for years. And I agreed.
But iv used some stuff in the past 2 yrs that had me buy more coils for the tanks.
Im right now using a little Smok single 20700 21700 mod and its a good perfomer. Have the Geek Zues up top. I have never been a fan of Voopoop stuff, but have 3 Uforce L tanks and just got before they are no longer available in Draconia (Australia) my misses a bunch of coils for it. She loves it and I do too.
I do like the Geek Zues tank and coils and have enough for a yr.
Personally im more inclined to recommend tanks and coils these days and can be hestitant mod wise. Iv dollied, destroyed, that many mods from early fails its ridiculous. Rarely I have a tank.