I tasted almost every variety and there were so many great tasting ones that I can only remember the one sole tomato that tasted really terrible.
Copia, hands down. Sour, weird off-flavor and even with a liberal sprinkling of salt it tasted awful. Deceptively attractive to the eye but
very rough on the taste buds.
Now I know why there was so much hype written about this variety. It needs all the hype it can get to disguise the fact that it looks much, much nicer than it tastes.