I like 10x in my western hunts, and to keep weight down I choose 42mm objectives. I prefer alpha glass, which is pricy, so that means I effectively have only one, a Leica Ultravid.
Here's my catch-all bino answer. It's not for everyone, but it's the conclusion I've come to.
A 12x50 is too much bino for most people to hold still when they're sucking wind and tired and excited.
An 8 power always leaves me (personally) wanting more. It's not quite enough. It's easy to hold still, but it doesn't matter because it leaves me wanting just a bit more magnification under most circumstances.
This leaves a 10x. It's low enough power that most people can hold it still, but doesn't leave you wanting any more. I'm out west and consistently am glassing several hundred yards away, so take that into account.
I primarily hunt pretty open country, so I'll take a Swaro 10x50 SV. I haven't seen the NL's, but I've seen 90% of the primo stuff and the 10x50 SV has no peer. Also since it was mentioned previously, if you take an 8x and 10x with equal optics, the 10x will out resolve the 8x every time, period, showing more detail.
8x42. Wider field of view and larger exit pupil. Can still see everything I can with a 10x42 yet only brighter, better depth, and longer into waning light. Win win.
I would select a good 8x for your stated purpose for several reasons. I have alpha glass 8.5's and 10's.
My new Pure's are much better ergonomically but unless you just want the best you can have some
great glass much cheaper.
Btw, I gave up some FOV with my new 10's but have just as much last light and they
are lighter and more compact than my 8.5's.
I just switched to some Leupy 15x’s after hunting exclusively with 12x50’s for the last 12 years. They are a little shaky free hand, but it is easy to use a trekking pole for a rest and I use a tripod for most of my glassing. They have eliminated the need for a spotter since I am not counting inches, just looking for mature animals.