I’m an arborist by trade, my favorite (favorite by random preference that makes zero sense and also favorite cause it’s my most used) is the alpine butterfly. I use this all the time including the limb cinch at my main tie in point.
Next most used is a slightly modified version of the double fisherman’s called the “hitchhikers stopper knot”, the hitchhiker is my main SRT work positioning & ascent device so I tie that knot a few times a day, once every time I change climbing lines (a couple times per job).
My next most used and liked knot is the cows hitch. It’s THE knot I use for all rigging, no questions. There are very few things a climber standardizes, this is one of mine, if it’s a rigging point or rigging redirect it’s cow hitched.
Also really like the yosimity bowline.
Anyone else climb trees? Should we have a favorite hitch sub-section? I rarely go back to DbRT but my lanyards are all setup with the Michoćan, when I do run DBRT without just switching over my hitchhiker I use a VT variant. My basil / snake anchor setup is based on a 6 wrap prusik.