Hands-down.......Binos.
I stopped carrying a rangefinder, couple years ago. If I forget my binos, I feel naked.
I use them to look at deer I might not necessarily be able to shoot, THAT day. but, if I see a good deer, I know more about "him", having glassed him.
It's also saved me from maybe shooting a BB a time or 5. Around here, the BB's are bigger than their mamas, late in our season. What looks like a nice, plump doe is often times a BB. Identifying this, early, is good woodsmanship.
I use my binos all year long....and for things outside of hunting. Besides my bow and climber, they're my most cherished piece of hunting equipment to have with me.