Among the tomatoes you have tried, which roma-types (for canning) do you like?
Locally, I have heard the hybrid varieties produce as much as three times the weight of fruit per plant. For me, that is very important, as I must put up a year's supply (about 100 quarts) by the end of the summer.
I am growing in a hoop house in New Mexico. Due to the altitude, the nights here are too cold and the season too short for tomatoes to produce much otherwise. That is true even for varieties that are adapted such extremes. Still, a few OPs could be interesting to try. Sometimes, the vigor of the hybrids is actually a problem when they overgrow the space planned for them (still working on predicting that).
For a slicer, I liked the Brandywine. It makes a great tomato sandwich, and it did well back in Massachusetts in my father's garden, but it barely survives here in NM, even in the hoop house. I like those pink tomatoes, which remind me of him.