It depends. Do you want to see deer or shoot deer? To see deer, setting up on a field edge is a good way to see the animals. In our area though, where there is a fair amount of hunting pressure, many times the deer don't get to the fields until almost end of hunting light. To take a deer, set up closer to the swamps, and catch them with plenty of light to shoot. May not see as many deer, but may have more opportunities to shoot one versus sitting on a field.