I find food from my garden consistently much tastier than food from the supermarket. Especially tomatoes, haricots verts, peas & lettuce. Tomatoes from the supermarket taste as if they injected 80% water. Haricots verts from the supermarket taste as if they're a month old. You wouldn't even recognize peas if you're used to frozen peas.

I don't know if the difference is because of different species of plants or different light conditions or different soil. Whether it's better for your health I couldn't say.