urghh... what is better,

ok,buying today, 120 tank, 2x AC110s, i was gonna add a canister, a xp4 to go along but the more i think, would it be better to use just 3x Ac110s. large bio storage aside. If i double sponge one Ac110, keep sponges mixed with the blue pads in one and the last just full of bio max and bio balls. Just wondering in your opnion what would be better, plus i believe 3xAC110s would be cheaper to run that 2x ac and a xp4. your opnions please. again BB storage aside.

ok..saving cash what if I already have a 3rd Ac110 on tap. just figured that would be 1500, campared to thr 1450. or does the room for bb outway the extra flow

thanks, i guess i just wanted someone tho say that, idk.. lol