Tomatoes grown for the store (assuming commercial) are hybrids designed to handle shipping better and have that "perfect" shape. Most are picked green with about 5% sugar content and then ripened in the store before being set out. Once the tomato is picked it's reached peak sugar content. When we home grow and let ripen on the vine they'll often have up to 15% sugar content and taste way better than the store even if it looks and feels like store bought.
When I lived in VA I subscribed to a CSA to add to what my garden produced. When I found I needed more Tomatoes to do my canning, I asked the CSA to find me local "Canning" Tomatoes. Those are the ugly, over ripe, imperfect tomatoes that generally go into compost. I paid like $10 per half bushel and they were on average 12% sugar and make wonderful canned tomatoes.
When I lived in VA I subscribed to a CSA to add to what my garden produced. When I found I needed more Tomatoes to do my canning, I asked the CSA to find me local "Canning" Tomatoes. Those are the ugly, over ripe, imperfect tomatoes that generally go into compost. I paid like $10 per half bushel and they were on average 12% sugar and make wonderful canned tomatoes.