I am partial to the 7mm RM, as I have been shooting it for 20 years now. I can't say that about any other caliber. Lots has been said about the new short 7mm's and even the .280 AI being very close to the RM, but IMHO it is hogwash. If you step up to equal pressure then the 7mm RM has the field covered. As a testament to the decreased performance loads in the RM these days, look at the older stuff. In Jack O'Connor's "The Rifle Book" he states that out of a 24" barrel he chronographed the 175gr factory loads right around the claimed 3020fps! Today, Remington loads the 175gr PLSP to a mere 2860fps, and the 160gr Core-Lokt Ultra to 2950fps. Meanwhile, they load the 7mm SAUM with the same 160gr to 2960fps. Can you say "marketing ploy"? In the lighter 150gr bullets both the RM and the SAUM are loaded to 3110fps, in O'Connor's book the RM with the 150gr was loaded to 3260fps. He tested the loads in a Remington Model 700. I can't speak to which of the rifles is better, as I have only owned one of each rifle you list. But the 7mm RM is the better cartridge.