I agree with the above gents who said the 7 is a lot easier on the shoulder, yet will get the job done.
If you don' t do a lot of off-season shooting, it won' t matter much, but if you like to keep your shooting skills sharp year-round, buy the 7.
If I didn' t already have a 7 Rem Mag, I' d buy a 7 WSM in a heartbeat.