Hi and welcome! Looks like a great list. I grow mostly heirlooms too but not exclusively. I am first year for some of the ones of your list but I have grown Mortgage Lifter and found it to be quite productive, right until the golphers got it! Made a wonderful sauce too! Good luck, LInda

Production varies with each type of tomato, the soil and climate its grown in, availabile sunlight, and nutrients available. Looking at your list, I have grown San Marzano, Mortgage lifter, Cherokee purple, Black krim, Amish paste
Brandywine and Roma's. From that list San marzano, cherokee purple, Amsih paste and the romas were the most productive. Mortgage lifter and black krim were less productive, and depending on conditions, Brandywine is least productive. My results should be evaluated in the context of my growing conditions. I live in Northern Utah, and have slightly alkali sandy soils. Our nights are cool and our days are hot. I have noticed some inverse correlation to productivity and taste, that is the less productive the better the taste. However, that is not always true. Good luck growing. Kevin

Hi, My Black Krim last year was not as productive as some of my others, but I am putting in more of them this year because they are so delicious. My Brandywine went gangbusters, until we had about a week of 100 degree days and then nothing. It really does depend on so many variables