Should I grow heirloom or hybrid tomatoes?
Plan to grow a mix of heirlooms and hybrids for a little insurance: The non-hybrid, or open-pollinated heirloom types are beautiful, delicious and a critical part of our genetic heritage, but sometimes they lack the disease-resistance (often labeled VFN) of hybrids. I like to mix it up, though my sentimental preference is for the heirlooms.
Remember that even with hybrids rated as having VFN resistance, the word “resistance” is the operative phrase. It means less-susceptible, not immune. There is no substitute for good cultural practices, whatever variety you begin with.
Some commercial growers have been adding a layer of insurance to their heirloom plants by growing them grafted onto more vigorous rootstock. More about tomato grafting is here.