Imported post
Well....
Speaking from personal experience, ( i used to dive an 18 + 2 pony's).. there is no benifit in using twin 12's as far as quantity ofgas goes, but in every other way twins are better.
better balanced, im tall but still found the 18 a bit hefty,also the 18 gets quite floaty when down to 50bar.
if like i did, you plan to dive the 18 with a bc, good luck, i found it was a pain to dive with (never tried a single 18 on a wing - might be ok) since getting the twins ive not done any single tank dives,put my bc up for sale and use my 18 to top up my twins for a second dive.
twins & wing is the way to go!