The article Ozzy posted pretty much sums it up. For your intended purpose, and cartridges mentioned, I'd go with the 270 Win. if I were at all recoil sensitive. I have killed plenty of whitetails past 400 yds. with the 270 and 130 grain bullets.....no problems there! I also have a 270 WSM and it is a little flatter shooting. I don't notice much difference in recoil between the two, but the WSM is a tad heavier.
Either 270 will get the job done for you!
F1
Either 270 will get the job done for you!
F1