You don't see many monocultures in nature. The more we try to bend nature, the more time and treasure we need to spend. So, my starting point is always a mix. I need a reason to plant a monoculture. We have a lot of weed competition and browse pressure during the summer, but weeds are generally not an issue with my fall plots and there are plenty of native foods in addition to the plots in the fall so browse pressure is less. I typically plant monocultures in the spring because it allows me to control weeds with a herbicide and follow them with a fall mix. Even when I plant monocultures, I mix if I can. For example, I'm far enough south that summer is a stress period for me. I usually plant RR soybeans in the summer but I also include a small amount of RR corn with the beans. This provides a little vertical cover in the field which encourages daytime use and gly can be used to control weeds. When the beans begin to yellow, I'll surface broadcast WR/CC/PTT into the standing beans.
There is nothing wrong with strip planting as long as you rotate what is in the plot. I like mixes because I can choose plants which complement each other. For example, the WR comes up quick and is the fall attractant in my plot. The PTT rate is low so it does not crowd out the other plants. Both of these benefit from the N that was fixed by the soybeans. It provides a good winter food source. The crimson cover takes off the next spring along with the WR. I run a tiller over the field but lift it so high with my 3-pt hitch that it barely contacts the top inch. It is enough to terminate the PTT before it goes to seed but does not cause a problem for the Crimson or WR.
Thanks,
Jack