Just following on from the blight thread, which is now locked. Jambop made the point that pot/ greenhouse grown tomatoes cannot rival outdoor grown for flavour. . I don’t have a greenhouse and grow Black Russian, Ferline and occasionally Roma but have found the later more blight prone.
Sorry this is an outright boast. My French cousin told me my Black Russians were as good as those at his local market in Provence . I think soil quality is important. My belief is the more you prepare the soil with kitchen compost/ well rotted manure the more those minerals will make their way into the tomato and enrich the flavour.