edges can still be productive in the morning, especially if deer use the edge to travel back from food source to bedding. Also less chance of bumping deer if you set up on the edge... if there is a heavily used trail in the woods that you know the deer are using then that may be better and worth the risk of bumping deer. If I am hunting a new area for the first time and haven't done much scouting, i prefer to hunt on the edge of a field with a good view that way I can see where the deer are making their entrance/exit. Sometimes the first hunt is more of a scouting trip with a bow in case you guess right the first time.