We are looking for some big red and juicy vine-ripened tomatoes but you can actually use just about any tomato variety from a Beefsteak tomato to Roma would work well. The "meatier" the tomato is the better the flavor and greater the juiciness will be which means a better flavor infusion with the salsa. Note that cherry tomatoes can also be a great option but due to their size you'll need a good amount of them and slicing them into quarters or eights can be a tedious task.