There are sources for both sides of this nutritional argument so it's just a place for opinions. Sources are not necessary and almost any logic will be accepted without contest albeit please reserve your government crackshot concepts relating to the secret urge to control everyone through fluoride in cans to yourself. <3
I believe that fresh is better because the preservatives added to canned vegetables to preserve them may have ill effects on our body. They also cook the vegetables many times before they can them and it's shown that the way you prepare vegetables can have a big impact on their health benefits.