I'll comment on what I've used.
Shooting sticks work well for me on short shots, but I wasn't as accurate on longer shots and didn't like having to move the sticks and rifle if the coyote came from an unexpected direction.
I use a Versa-Pod bipod now that extends to 31". Its about perfect for my needs. I've also have a 9"-12" Versa-Pod for prone shooting. I order one of their nipple attachment and bedded it into the end of the forearm on my stock so the gun still has a "clean" look to it when I take off the bipod. My favorite feature of the bipods is that the legs extend when I push the button on the legs. Makes it easy to get the rifle leveled up.
Haven't used a Trigger Stick in the field, but have played with one in the store. They seem nice.
Alot of people really like Harris bipods. I used one for a while, but didn't care for it. The spring were too noisy and I didn't like how the legs extended.