Rob,

Generally people hunt from the higher elevation and I would give the following four reasons:
(1) you can see better and farther, (2) you won't be at eye level when the
deer come over the top,
(3) your scent won't circulate as easy down in the valley or draw, and (4) you may have a better
chance of getting in your stand undetected coming from the backside of a hill. There are probably
setups or situations that call for hunting a draw or bottom, but I don't think there are a whole lot of them.