I assume from your post that you would recommend your best surrounds in the rear rather than on the side?
Depends on how you set up. If doing a 7.1 with back surrounds on the rear wall for Dolby EX and the like, then yes, your best surrounds go on the sides.
If doing a 7.1 with processors like Meridian, which use the rear and sides for 2ch enhancement or even Dolby digital 5.1 -> 7.1 enhancement, and you flag the rears as primes, the sides could be smaller / less capable. This is what I do.
So, it really depends on the processor your have and how it can be setup and how you will use this.
[Setting a record for delayed response with this reply, hope it’s not to late ]