In next door Albania they are called "Zemërkau", which it translates "cuore di bue". Very delish, and fortunately local farmers like to grow them for themselves, so you will always find cheap good ones during the season.
The reason they are really good as they are the most similar to the original wild tomatoes, and less likely to have been modified just because their color and shape as most grocery common tomatoes are.
I've had amazing tomatoes of this species, but I've also had many watery ones...so I'm guessing the greenhouse-to-supermarket waterbombing effect is more important than the actual species.