ryansoh3
(ryansoh3)
6
16340’s are very common, but we do prefer 18350’s for its higher capacity and snug fit. 
What application are you going to use? Interestingly enough, I found 18350 Ultrafire’s to have higher capacities than AW IMR’s.
If you don’t need the high current, I’d use the Ultrafire/Trustfire cells and save some extra $$. (Go BLF!)