Subwoofer question

What will the difference in SQ and loudness be between a Polk/Momo 12" dual 4ohm VC sub and the similar RE 12" SE (i think its the SE that is closest at about 600w RMS?) if either was pushed off the same amp? i have all polk speakers so i was thinking to keep things simple i could go with a polk sub as well. unless someone can explain why the RE would be better? if anyone else has any ideas for a dual 4ohm VC 12" sub to run about 400w RMS and costs less than $200 for SQ please post that as well. thanks

sorry to repost but maybe i wasnt clear above, i do not mean i want to run both off the same amp i mean i will run one or the other, i want to know what the dfference between them would be. hope that clears it up if anyone was confused.

sq wise, the re is a bit more crisp sounding, tighter but that is really affected by the box. spl wise i cant tell you about the re se as i only heard it a low level, but i dont think the momos hit as hard as they should. purely sq wise i would go with the re.