I'm in Zone 3a
Sub Arctic Plenty is the first tomato I stopped growing and gave all the seed away. It was the only tomato that was affected by cold in my greenhouse
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Although some don't like them Sandpoint and Silver Fir Tree grown in pots are my first tomatoes and I like them. Sandpoint did better in the ground.
Later tomatoes that did well for me are Black from Tula, Purple Prince (my best producer probably because my wife doesn't like it), Japanese Black Trifele, Moldovan Green, and Chocolate (just Chocolate)
I grow Sweet 100s and Ildi. I'm hoping to try some different ones this year.