I had that same choice and went 7wsm. No regrets.
Which rifle?
I had a Win 3" and a Ruger short action to build a PRC.
Ended coming across a good deal on an Ed Brown 7mm wsm,
I have no doubts of the capabilities of the 6.5 PRC as I have since day one been a 26 caliber slut.
But for elk hunting, and really everything else, the 7mm wins for me. And, Ed Brown made a pretty nice rifle.
