I've only tried Whitetail Institute, I haven't tried all of the products of theres that I'd like to yet, and if you call their 800 number they're super helpful.
Our main nutrition plot is 6 acres in the middle of our 160 acres. We have it planted in WTI's clover and the deer love it. They eat it almost year round, I checked it the other day and they're digging through 18 inches of snow to get to it. I shot my 9 pointer with the bow while he was chowing it this October and he had 4 other bucks with him, and there were several does and fawns eating too. Our soil is very moist, alot of clay in it, and the clover seems to thrive. I guess it doesn't do to well in drier soils but the alfa rack is supposed to fill that niche.
One negative note, we planted 6 acres of buck forage oats this year on 2 harvest plots and it was a bust. Compared to our rye plots, which were very good, it really didn't draw any deer in. We did have a bad growing season so it may have done better on a normal year.
I'm hoping to try WTI's "wintergreens" this year to muzzleload over, and their "pure attraction" too, I've heard deer are nuts over the peas in that mix.