Anytime you can take fresh ingredients and make a meal, you’re 100% better off than any pre-made processed crap you’ll buy.
I have been doing a low-carb since January. It seems that canned veggies have additives [especially sodium], whereas frozen veggies have none. I steam/stir-fry the frozen mixed veggies. Even the so-called healthy frozen dinners have all kinds of additives.