Anecdotally vegetables I grow are wildly more flavorful than ones you can buy. Like think grape tomatoes as sweet as grapes. Green beans that a have complex flavor almost like green tea. The butternut squash that I accidentally grew this year from seeds that survived the winter in my compost tastes like a pumpkin pie. Corn that you can eat raw and that putting butter on feels like a waste.

That’s not to say you cannot get really good food that’s not “farm fresh” but food right out of the ground absolutely on average is better.

As long as you don't consider the growing season in the averages. Yes, garden fresh food is great today because you can get vegetables from the store when yours are not in season.