Hard to narrow down without considering what terrain your hunting. For me personally on my Colorado hunts I leave the 10x42's at home. For binos I use Meopta 12x50's and a 11-33x50 razor spotter. The 12s are still okay to pull up to take a look at something but also have good fov and great glass when on my tripod which is where they spend most of their time. The Razor spotter is pretty impressive for it's size. I definitely use it more because it is so small and light. Granted a fullsize spotter would be better for counting points at a mile, but for my purposes the 33 power is still enough for deciding if what I am looking at is worth going after.
I've used a friends swaro 15 binos and they are very nice. I think for long sits having the ability to use two eyes vs one is an advantage. I have spent hours behind my 12s while on a tripod without a problem. On the other hand I have watched another friend glass with his Nightforce spotter for hours hunting mule deer and using one eye for hours didn't bother him. May not be really helpful to answer your question but this is what I ended up with when I was considering a pair of 15x bino's.