I leave some on a second year vine if it's big enough. So vine size is the key in my opinion. As with all young fruit vines/trees, I thin extra heavily. So how big is your vine? What is the caliper of the trunk? How big and long are the canes and how many did you leave? How many sq ft would you expect the vine to cover this year? Is it in full sun? These are the factors I'd consider.

There are quite a few choices. The link below shows several that are suitable for zone 10. In Charles Boning's excellent book "Florida's Best Fruiting Plants" he discusses even more varieties, how to grow them, taste and uses. I have 6-7 varieties now, and get a bountiful crop every year. Lisa Here is a link that might be useful: Just Fruits and Exotics grape page

Thanks! I was able to find it searching wild grapes...I never knew of a variety with that large of leaves...found this...Vitis aestivalis var. bicolor

Pretty darn impressive and a clever way to grow it. We have some wild grapes here (muscadines) that are about twice as tall and twice as thick as that. I'd guess ~80 feet up into crowns of forest trees.