I can't help but agree with Supercub's comment, although I, known for my diplomacy, would probably have put it a little differently. In addition to the awkward appearance, the large objective scopes are heavier and their bulk makes them more susceptible to damage in a fall. If weight is a consideration, or even if it isn't, I prefer fixed power scopes. They are lighter, more resistant to recoil damage, and more compact than variables. A 4x32 scope will actually be brighter than will a 3.5-10x50 at the top setting. If the variable is set at 4X, the difference between the two, while theoretically favouring the big scope, will be difficult to see.
The riflescope is an aiming device. On big game, a four or six power scope will work fine out to four hundred yards. In fact, I have no trouble hitting the 500M rams at the silohuette range with my old Springfield and it's 2.5x scope.
My rifles, when used on a mountain hunt, are likely to get used pretty hard and the stronger, more compact scopes are better for this use.