There are a lot of them and some of the cost is for the name. First ask your self if you really need/want one. They have there place, but I have more “real word experience” without one then I do with one, and I can take it or leave it. See if you can use one first to see if like them. If you are running lights and other cool stuff with pressure switches, then look at the ones that have the inserts. The grip pod type are great little bipods that are out of the way when not needed.
Bottom line, get the one you like the most that does what you want it to do.
I run a $20.00 one on one weapon, and a pod on another. The one thing that I learned the hard way, NO ALUMINUM! In the cold your hand pay for it, frost bite is not your friend.