Back to the game so recently I've only tried but 3. Fortunately for me all 3 are winners!!
In order of preference.... as of today (-;
1) Joyetech Ego-CC - Built like a shiney stainless steel vape tank, easy fill, uber great wicking, don't see how it could possibly leak.
2) Innokin iClear 16 - Little tricky to get it to wick straight VG but once it gets going it's a fine warm vape.
3) iSmoka 3.5ml Mega BCC - Simple no frills all day supply that just flat out works.
ETA: Oop! Forgot about the Evod.
Leaving room for future favorites 4 and 5....
6) Kanger Evod - PITA to fill, I swear it was loaded with crankcase oil out of the box, sight windows so small I couldn't see the liquid level.