best being most tonnage? most palatable? one you consistently shoot large deer in? How i measure a food plots success is the seeds ability to maximize sward density/nutrients per acre to grow the biggest and healthiest deer i can grow.
Beats and cowpeas are a new one to try for me! And when I say best I mean best all around not better for one thing or another
Honestly, cowpeas are hard to beat for a summer plot...deer will run over you to get to them. I mix cowpeas in with milo for grain production and it works great.