There are few squash that will out yield zucchini per acre. They run between 15,000 - 28000 lbs/acre in commercial plantings. Winter squash can under certain conditions give a higher poundage per acre, but that is for mature fruits. Zukes are harvested at 0.5 - 1 lb fruits. While any winter squash can be eaten small, they typically do not set a large numer of fruits.Flavor is another thing to considered. Butternuts and acorns are the only ones used as summer squash with any consistency.

Now if you just want a dual purpose squash with the highest yield per plant, that would probably be the Trombocino. Actually a butternut type, but mostly used as a summer squash. Rampant vines so plants per acre is low.

So if I grow vining types, is it usually 1 good size winter squash per seed? or is it per vine? I.e. as the 1 seed grows and splits into multiple vines could i expect fruit from each vine getting smaller as the vines branch out and form new vines?

I was just thinking if that is the case, and 1 vine type takes about 100sq ft, perhaps it would be better to grow many bush types that take closer to 6sq ft, but if the vine drops a new fruit at every vining growth that might outyield the bush right?

Sorry just in the research phase here, it is apparent I have never grown vine squash before, thank you for any and all knowledge.

Ving squash are quite variable. The larger ones may set set 2-6 fruits per plant while small ones can set over a dozen. All commercial summer squash are bush types Crooknecks, Straightnecks and zucchini) there are several dual purpose vining types like the Trombocinos, marrows, and some Asian types.Bush types yield less per plant, but you can cram a lot more plants into an acre. Another zucchini substitute you may wish to experiment with is a variant of the bottle gourd usually sold as Cucuzza

How much zuchinni do you want to grow?