i have my choices narrowed down to a 2x10 avatar on top of either a 2x12 cab or 2 seperate 1x12 cabs. the 1x12 setup would obviously be more portable. i play in a loud rock band and a church band so i could just grab a 12 when i play in the church band. are there any other avantages to having seperate 1x12 cabs? ive heard that speakers benefit when stacked single file vertically. is this true?