It might depend on the quantities that you are harvesting at any given time. Usually when I do canning it is because I have bought boxes full of whatever I want to process. When I am just picking a bowl full of ripe tomatoes I would roast them, puree and then freeze them in portions for when I need tomatoe sauce. I prefer frozen peas to canned. I do can tomatoes every two years, but I buy them when they are in season. Same with peaches. Plums and pears I can because I have access to trees that bear much fruit. Apples I peel, slice and freeze because my family prefers apple sauce made "fresh" instead of canned. A lot will come down to preference. Ohh, you are wondering about veggies, not fruit.
Which veggies are you thinking of?