x2Incorrect. The fact that they have the same motor is irrelevant. The 12s can displace more air by virtue of greater cone area, in addition to going a bit lower than the 10s.
the biggest reasons i see people going with 10's is:
1. Uses usually 1/2 the space of a 12
2. "r u shiitin me? that was only a 10???" factor
if you have the room, and thats a IF you have enough proper room, i'd hit 12's...