There are the ones that look like chili peppers and the ones that taste like cotton candy are my favorite. These were at Trader Joe's yesterday:
They're ok, cotton candy grapes still my favorite. Sugar Crunch has like a "dry" taste to it, it's a little different from your standard variety green grape, sweeter and harder obviously. I'd still buy it again, because you don't see these everyday, but always on the lookout for cotton candy grapes.