the best option for no leakage would be a top airhole one. I love my rogue, totally leak proof, nice clouds (no competition but perfect for me) I've heard that the vector is a goon one in that department.
the hobo 3.1 works really well and as the airholes are a bit on the upper part of the wall doesn't leak as much.
back in the day you either had to look for a flavor
rda or a cloud rda, but now almost any rda has the ability to make clouds, but not all of them have a great flavor. so it is better to look for a flavor rda first and see if it can cloud (most will).
if you like the looks of the derringer, the stumpy looks like the much improved version of it, I can't give you my opinion as I'm yet to receive mine
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