Klipsch F-2 or B-2 for Surround speakers ???

[spinner747]

I have 2 Klipsch F-2 , 1 Klipsch C-2, Klipsch KSW-10 sub,Yamaha HTR5960.
What will sound better for surround speakers in medium sized room F-2 or B-2.
(F-2 on sale just $100 more than B-2). Please help to decide.
Thank you ALL !!!