I have planted a few different brands of food plots....... As far as a green plots goes from my experience i would suggest that Antler King Honey Hole is the best brand that I have come up with. Corn on the other hand is a great food source, and good cover for whitetails, and if planted and maintained right can keep the deer with a vital source of food throughout the winter.
The thing i noticed about the ANtler king is the deer never really touched it much until after the first frost (which is supposed to happen) the roots of the antler king hold sugars in them, and when the first frost comes along it shoots the sugars into the leaves and the deer just MAULED it!