I am looking for some advise, I'm looking at getting some euro cylinders, I tried on some round bottom ones and they felt better than the faber twins cyinders I have, I see a lot of people diving with both round and flat bottom ones, so now I have to figure out to either round or flat bottom. I do a wide range of diving, mainly in a drysuit, and often off the back of a boat or RIB. which one would you guys reccomend? and why?