Just my $.02. I have haris, caldwell and vera pod. I no longer use a bipod when hunting becouse it has cost me to many times. If you are using a bipod in the deep snow and a yote pips out of the brush to your side, you may as well forget about it. You have to pick the legs up out of the snow or tall grass before you can turn. With shooting sticks you just turn and shoot.
The question still needs an answer. I prefer the prone versapod. It allows you to pivot and turn, the harris only allows pivot. Another difference is that the versapod uses springs to deploy and haris uses them to retract. Also the versa pod allows you to stow the legs forward or backward depending on how you feel at the time.
