The Atlas or Sinclair bipods are the best IMHO, Harris is very good, had a few Caldwell and Blackhawk are both fine as well. Shooting sticks are OK but I dont like them if I am making a longer shot. I also use a shooting mat, even when out shooting prairie dogs or yotes where I have to move a bit. Its easy enough to roll it it and sling it on my back, and just as easy to throw down when I need to.
Something else that really helps are knee pads. In taller grass or brush where you have to be up off the ground instead of prone your knees will take a beating, and even just a set of foam knee pads will make a huge difference in your shooting comfort, and the more comfortable you are the better shots you make.