Harris bi pod, & or pack for prone, L/R work.
Tree, rock(s),fence posts, knees to 400 ish yards, unless I can go prone. (to quote a previous post, I'm an "opportunist")
Off hand, or knees for 250 & less, unless I have time to go prone, or take advantage of a natural rest (tree etc).
A lot of it depends on the terrain, & distance. At longer range the critters rarely know your there, so you can take your time for arranging the perfect set up. For me that's leveled bipods for a front rest, a pack for a backrest, & comfortable shooting position, with a natural point of aim.
I try to use a rest whenever possible, but at closer range, or in thick country, you gotta be able to shoot off hand or you eat your tag. I hunt it all, so its rarely the same rest, or position.