it seems I am about to say the exact same thing as many others. Both! okay let's back up and I will explain the case for both of them individually. a good bi-pod is indispensable in the field. I have many bi-pods, some permanently attached to certain rifles. these are for when I know I will be taking a prone shot on nearly level ground or I can level out the ground with extending one leg farther than the other. I also use my backpack as a rest in certain circumstances. I wold never go into the field for a hunting trip without a bi-pod. I have used shooting sticks on occasion. but it is far more often I will use a tree limb to steady myself in a standing or kneeling position. shooting sticks are for when you need to stand and shoot without any trees around. that is the only case I find in my 30 year history of hunting I have ever needed or used shooting sticks. if you wanted to know what is used more often by me, Bi-Pod hands down.. trees are 3rd. sticks are last.