Plants that need frequent tending, like tomatoes and green beans, I prefer to have in beds. That way I can walk through and harvest every day without compacting the soil, and it’s easier to reach all parts of the plant.
Plants that don’t need frequent tending, like dry corn or winter squash, I prefer in plots, because I’m basically planting and ignoring them. Plots are more efficient use of space, because you don’t need to leave a path every few feet.
If I was growing sweet corn, I’d probably have it in something in between those two. A plot with every 4th or 5th row missing, so I could reach the middle ones, but still have them close enough together for good pollination. (Corn is wind-pollinated.)
Like with so many things, the answer is “it depends” :)
It sounds to me like you have great answers! I have so much to learn...
What is dry corn?