Main competitor is the bowline which can be undone more easily when loaded but is harder to remember + get right every time (for me at least, maybe I’m just slow with knots)
I remember I used to sport climb with a mate who insisted on tying in with a bowline. Not only is it harder to tie but it's also harder to check if it's tied wrong. And anyway, figure 8s are just prettier knots
Re -climbing and arborist stuff.
If you had to use and remember one knot what would it be ?