I am still adding to my optics, upgrading, and learning; but in my limited experience I think it all comes down to the particular hunt you are on. For me, that is typically archery elk in the timber, and my 8x32 EL's are absolutely perfect for that. Light, wide field of view, easy to hold.
I have a razor 80. I never pack it in, exclusively used from the truck. I want to upgrade to Swaro atx 65 (Or similar), but that will be down the road when I draw the right tag to justify it. Other than Aoudad hunting, I really have not hunted in country that required a spotter.
I just added MeoPro 15's and used them last week for Spring Bear in MT. The ranges we were in had a lot more open tops than anywhere else that I've hunted thus far. The 8's were still awesome in the timber, though a little underpowered for the long range stuff. But man the 15's on a tripod were game finding machines. I am really happy with this addition to my kit for hunts with more glassing opportunities/requirements.
I also used the spotter more on this hunt, but again it was only from the truck and after I had located game with the 15's. I find it much easier to cover the grid with the 15's than with a spotter. I'd put the spotter on to get a closer look, or to go back over some spots with higher magnification, but I never found anything with the spotter that I had missed with the binos. For this hunt the spotter (no matter what brand) would not be worth the weight penalty. These were 1-3 mile distances we were glassing. I have had very few opportunities to glass any further than that on any hunts thus far, but if I regularly hunted country like that then the spotter would probably be the go-to if I couldn't have both.
Anyway, I plan to have the 8's, 15's, and one day a good spotter in my arsenal. Then I just pick the combo that's most appropriate for the country I'm hunting, the conditions (solo, truck camp, etc) and the tag in my pocket.
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