I noticed that was not an option on the poll!
We will eat any seedless grapes, but the last couple times I bought them Kroger had huge black grapes on sale and they were really good.
I was actually thinking about this the other day. I only buy green grapes. I like red seedless grapes fine, but I grew up in a house surrounded by vineyards (seriously) and we would eat the green ones all the time, but the red were seeded and used for wine/juice and not any good for eating. So I just buy green.