I have both and really enjoy both. The .270 Win is a Ruger 1A I bought for my wife. It's an MOA rifle with 150 grain Swift A-Frames at a leisurely 2700 FPS or 130 grain Sierras at 3000. My wife used it to brain a crocodile, and I've killed Eland, Zebras, kudu, etc. with the 150 grain load. My dad who'll be 84 this year has taken several big whitetails with the 130 grain load the past few years. Everything you shoot with it dies without a lot fuss. It's a mild recoiling gun but has serious muzzle blast because of the short action and barrel.
My .270 WBY is a NULA model 28. With 129 grain LRX's at 3375 and 150's (Hornady interbond and Berger VLD) at 3175 it's a hammer. The difference in reaction when you hit stuff with it is very different than my moderate .270 Win loads. Legs "go loose" on impact and most stuff drops at the shot, even with lung shots.
