Just a set of 10s for elk they are pretty big and easy to see. I would like to get a set of 18s for dedicated glassing days when I want to see a little more detail
I do not know anyone who only glasses primarily with a single spotter, unless it is a BTX. I know people who glass with two spotters connected on a plate.
Glassing for Coues, mulies, speed goats, bear, elk, etc.
Swaro 12s, 15s are the predominant followed by Razor HD 18.