I like seeded Concord grapes best. We have some in the yard and so does our neighbor (they grow over our fence so we pick some of his, too.) Now and then I'll buy some Concords at the produce stand before ours are ripe. I tried Cotton Candy grapes last year and liked them, but they're too expensive except for a treat, imo. The others don't taste good to me, so we rarely buy grapes.