I'm sorry, but...
BFBC3 - 30FPS
MW3 - 60FPS+
BFBC2 - EA
MW3 - IW
Battlefield will always be in the shadow of Call Of Duty.
Battlefield 3 will be developed by DICE and published by EA
Modern Warfare 3 will be developed by Infinity Ward with the help of Sledgehammer Games and Published by Activision
Also I recently rented BFBC2 and I prefer the multiplayer in Battlefield over CoD and the difference in the FPS between the two games wasn't noticeable