if i ever do a cover crop it will be peas, this way i can harvest the peas and have nitrogen fixed soil where they grew, i also like the idea of clover as a cover crop but it is a pain to get rid of it once it starts.
ive also tried the three sisters 2 years ago but forgot the squash, my corn and beans did good but the beans got to heavy for the corn and toppled them over, it was not the best place to grow corn though so they were not the best stocks