RE: which gun on opening day?
I choose between my two hunting rifles (7MM RM and .308 Win.)the scientific way, I alternate them each season!
After a few years of this, I've just about put the 7MM away for good!
The .308 with a shorter barrel,works better as a "stand" hunting gun, and it really seems to do a better job on deer size game than the 7MM RM does!
Either of the calibers you have will do fine, pick one and get out there!