I can't think of any heirlooms I would avoid, but there are some that have had consistently poor yields for me. These include Old German, Green Zebra and Black Krim. I get pretty good yield from San Marzano, but they don't seem to have much inside them. Purple Cherokee yield is very inconsistent and I can't find any reason why. Yellow Pear seems to have been mentioned quite a lot, but I have had very good luck with it and the family loves them.
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