There's actually an argument to be made that some frozen or canned vegetables have higher nutrient content than the equivalent "fresh" vegetables at the grocery

There's actually an argument to be made that some frozen or canned vegetables have higher nutrient content than the equivalent "fresh" vegetables at the grocery store, since the frozen ones are harvested closer to peak readiness and packed proximal to farms, versus the "fresh" veggies which may be harvested well in advance of when they're ready to give them adequate time for long transit to stores and a reasonable duration of shelf stability. I believe this is the case for tomatoes—not sure which other crops. Unless you've grown them yourself, canned tomatoes will generally make a tastier pasta sauce than their fresh counterparts.