Here's what I assume are the big differences between pots outside vs. just the ground

Pots:
â?˘You know what is in your pot, it is easy to flush and work with nutes
â?˘Needs constant attention as far as pot size vs. age of plant and root bound issues
â?˘You can bring them in if you absolutely NEED to!

Ground:
â?˘If you're not using your own soil, you have to do a bunch of tests with the soil
â?˘You won't get root bound

That's all that I know...I hope this helps