My favorite grapes don't grow well where my garden is. You may want to see what varietals grow well in your micro climate by checking fruit growers resources in your state/county.

I agree with Trudy about checking to see if your local climate is right for growing table grapes. I planted 3 seedless varieties (green, red, and purple) about 18 years ago but after several years of failed crops I ripped them out. The problem was that my zone 7 was good but my climate was not. Way too humid here which resulted in fungal diseases that kept the crop from reaching full maturity. I prefer not to spray my fruits with fungicides and insecticides too which most likely contributed to their poor performance. I hope you have better luck with yours.

I haven't grown this but my favorite is Thomcord, a cross of Thomson Seedless and Concord. I just picked up a Blueberry Seedless grape and planted it against a 6' chain link fence, hoping to train it along the top rail. The key to grapes is pruning off 90% of the growth at the end of the season or it will take over.

Thomcord grape