Sally, Thanks for your reply. Yes, your are correct. Some of these healthiest vegetables may not necessarily be easy to grow. It depends a lot on your climate and your experience. I have lived in several different states, with extreme environments (from MN to AL), and have learned how to grow all of them in these environments.
It is well worth the effort to learn how to adapt to your environment if you want to grow them badly enough. And for some, it may not be worth the effort, so I recommend going with the vegetables you enjoy growing and eating the most.