Hello,
I don't know of any red or black that would be described as "super sweet" or with a high brix
There are lots with a complex sweet/tart flavour though. For a black, I thought Margaret curtain was excellent. For a red, you may wish to explore some of the red, not pink hearts. some of them can be described as sweet as well but not extremely sweet like sungold.
as others have mentioned, for sweet in a full sized tomato, the bicolours and many pinks would be more reliably sweet.
KarenO
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