I've boiled my optics down to two three which suit how I hunt regardless of game and terrain. I'm not dogmatic in saying it's THE way but for me it works out well.
I carry a lightweight, compact Leica 8x32 Ultravid for general hunting use where animals don't necessarily have to be sized up or judged. If, as on a trophy mule deer hunt, most of the hunting will be looking or glassing canyons, I use a Leica 15x56 Geovid on a tripod which is so much easier on the eyes than any spotter can ever be.
I do have a Zeiss spotter, a 15-45 x 65, a relatively compact piece that is mostly used for determining if that reddish spot three quarters a mile away is a fox or a bunch of balled up corn leaves.
I have given up the heavier, bulkier 10x bino's for general hunting purposes.
