Frozen produce is harvested at peak, frozen nearby, and then transported. The texture suffers, but in other respects this is far superior to the “fresh” produce you get, which has to survive transportation at room temperature. Whether you would prefer frozen depends on what you are getting and how you prepare it, but there are tons of scenarios where you should prefer frozen foods.

Certain foods are clear winners frozen, like peas, corn, spinach, if they are going to be cooked. If you’re making sauces, fillings, pies, etc from berries, frozen berries are your best bet. The non-frozen berries have to be shelf stable and the shelf stable ones don’t taste good. The good tasting berries keep well frozen.