It's not so much the variety, but the way it's grown. If you grow one tomato in circumstances with insufficient light (or light of certain wavelengths) with lots of nitrogen but insufficient minerals, and planted at the wrong time of the year (something to do with the length of the days and radiant heat - so this varies by location), you'll get different nutritional content from that same seed if it were grown under better circumstances.

Some say there is a relationship between nutritional value and Brix readings of the juice of a plant/vegetable; Brix is essentially a measure of the amount of solids in a fluid. I can't find reliable literature confirming this, and the soil/plant/nutrition scientists I work with don't know either (but they don't dismiss it quackary either - it just seems there's not enough research). Either way, a Brix meter is cheap from Ali Express, and I can sort of (meaning: not properly verified, not sure how it would look when properly statistically analyzed) detect patterns in Brix readings from cheap supermarket lettuce, farmers market lettuce and home grown lettuce (and some other vegetables).

So if this is something you're in to, it's well worth it spending $15 on a refractometer and playing with it yourself. Oh and if you're going to make your own wine, you can use it for that, too :)