For me it has more to do with the area that I'm hunting. Highcountry deer hunting I won't use the bigger as I will have the spotter with me all the time. In desert country the bigger binos can work really well and many times it's struggle with the heat waves through spotting scopes.Sidebar:
I'm curious how many guys carry 10 x 50 binos as opposed to 10x42's....?
In some cases you're only taking an inch longer and 6-8 oz more.