What's the difference between canned Italian tomatoes and regular canned tomatoes?

There are thousands of different tomato varieties that are grown all over the world. They have different flavors. The Italian variety may taste different and maybe not. Best bet is to try a can of each and see if you can tell any difference. Most canned tomatoes are hybrid and have little flavor. Heirloom tomatoes have a much better taste, are more difficult to grow, and cost a lot more. To most tomato specialist, the difference is incredible. I grow 10 different varieties of heirlooms and cringe at the thought of eating a "grocery store" tomato. More than likely the "other" ingredients you add to the sauce makes the real taste difference, not the tomato.