I'm not quite sure what you mean "what seed works best".
I'm near the northern fringe of deer habitat. We get deep snow and the deer migrate to the yards. Our summers are short but long enough to grow some great food plots.
I planted 7 different plots on August 7th with my favorite mix:
50% tyfon turnips
15% Biologic Maximum
10% Canola
20% dwarf exxex rape
5% purple top turnips
All the above seeds are part of the brassica seed group. They grow fast, are high protien plus lots of tonnage. They usually are left alone until the first frost or freeze of the year. After that the deer don't leave them alone. Some of the plants are already 20" high and over 8" across.
Ceral grains are another good draw for hunting season if planted a little later. Rye, wheat and oats fall into this group. I planted oats on Labor day and they are about 6" high. Deer are in them already.
As far as perennial seed, clover is the best seed for my area. It greens up real nice in the spring and has high protien levels most of the year. At least 60% of my plots are perennial clover. Designer clovers cost more but they last for years which makes them cheaper in the long run.
Farm crops also have their place in food plots. Standing corn is great for winter carry over. Alfalfa is great in the summer but requires maintenance. Peas and beans ar great both for spring and alter summer planting.
I have a little over 10% of my land in high quality food plots. I spend hundreds of hours annually working to ensure my land has the best groceries for miles around. Food plots aren't cheap but are well worth the investment of time and money. Be advised they can become addictive.
www.Michigan-Sportsman.com has a habitat forum that could be a real help.