Making cuttings from favorite Tomato plants that have proven to be good producers works here of course in Florida. Still need to use the little greenhouse in Winter to yank them trough, and they produce throughout the Winter in that situation.
I believe in collecting seeds from great producers once grown and proven over several seasons. They adapt and the babies are tolerant of what the parents have survived.
Tomatoes will hybridize if you try too many sorts. I am now sticking to the one I've grown several years that produces incredibly well; is acclimated and am not trying to go exotic any longer.