I have both wouldn't want to part with either one. I see about 150fps diff between the two, but partly because the RUM/700 wears a 26" tube. Both have been quite easy to load for with the RUM pushing 180NAB's over Retumbo @ 3365fps and the Roy pushing 168TTSX's over H4831 @ 3300fps.
I think it would be as simple as which platform you prefer. 700's are...well 700's, but my Vanguard cycles those big cases a bit smoother then the Rem.
A normal hunter won't shoot the barrel out of a RUM/Wby in their lifetime.
Brett