So, I have had a 264wm. Decent MTU profile ss barrel. I couldn't get it to shoot under 1 moa. Not cool in my opinion. I set the barrel back an inch and rechambered with a different reamer - still couldn't tighten up my groups. Little better but not ideal. I rechambered it to 26 Nosler. Now I was able to shoot fairly consistent .375" groups with the occasional. 300" 5-shot group. Running 140 vld's 3300fps comfortably. I could go faster. This is with 85-86gr of slow burning powder.
I have several 7mm guns and 6.5 guns. I will never go 264wm or 26 Nosler again. Barrel burner cartridges and very inefficient.
Just built a hunting rig for my son in 6.5 Sherman SS. Impressive. He runs 156's 3000fps easily with H1000. Can approach 3100fps with some of the RL powders. Powder weight, you ask? Around 60gr. Compare that to the 264wm and 26 Nosler. Still a barrel burner - not quite as bad. Son's barrel is 24". My 264wm was 27", 26 Nosler 26" (didn't set back when I rechambered from 264wm to 26N).
I currently have 6.5x47L, 6.5 Creedmoor, and 6.5-284. 6.5-284 is also a barrel burner but only slightly compared to the mags.
The 6.5-284 and Shehane variant along with the 6.5SS are where I will stay for 6.5 bullet max performance.
To answer your question, finally, I would definitely go with the 7mm Rem or, even better, the 28 Nosler. I know, I know, what about the 7 PRC? Maybe. I'm not a Hornady horndog. Hornady is pretty, I'll leave it at that.
Longer barrel life with the 7's. Heavier bullets - better BC translates to farther distances for taking game.
7mm Rem offers a heck of a lot more choices when it comes to commercial cartridges. You can get 264wm, 26N, and probably even more so in 7 prc once all the horndogs start demanding it. You can outperform all of these in 7mm if you handload and go with a wildcat cartridge. Sorry, I didn't mention the 260 above, but I don't have any experience with. I know it's a great cartridge and can be made hotter (improved) and accurate as heck, but I don't or haven't played with it.
Sorry for the book.