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In my experience, the flavor of a tomato has almost nothing to do with genetics and almost everything to do with time of harvest and vine ripening. If you grow the tomato yourself and wait until it's ripe to harvest it (unlike commercial tomatoes, which are all likely harvested green and often grown in hot houses), it will have that flavor we all associate with the summer tomatoes of our youth.

I'll bet I could take a commercial strain of tomato and grow it in my garden, and it would still taste better than an heirloom tomato harvested green, sprayed with ethylene and trucked all the way across the country!