Personally, I think you're shortcutting the process by a heinous amount if you actually eat the grape.
I've even short cutted that.Personally, I think you're shortcutting the process by a heinous amount if you actually eat the grape. But if you must, then green all the way. Sweeter in my experience.
If you're going to treat the grape properly, and wait for it a little bit, then red is the one for me.
Either is fine, but I guess I like the green grapes a little bit more, though. I grew up on those.