I like the Versa Pod over the Harris. It swivels and pans which I personally like. I don't keep it on my rifle but just use it at the range. You can use the bipod on a variety of mounts. I have one for picatinny rails and one for a freland rail. The newer VP models do have a two-way lock but I have not used one.
Others, however, desire a more stable bipod and so the Harris fills that bill since it does not swivel or pan. I don't like how it "jumps" back on recoil because the legs are so stiff. You have to reset it on the bench for just about every shot. The VP swivels back on recoil so you can get off a few rounds before having to reset anything.
The Harris is great for stable shooting and allows for a little more accuracy, but for faster shooting (and is there any other way with an AR and a 30 rounder?) I do like the Versa Pod.
My opinion only--YMMV.