Although I had to battle the skeletonizers last year, this year, I'm having a problem with small grapes.

Red Seedless:

They are really small, slightly larger than a peanut.. and many of them in their bunches are raisins. Also, the individual grapes fall off very easy, and leave a portion of the stem in the grape.

Thompson Seedless:

Very small, no raisins, but the grapes themselves fall off easily and when you do get a grape pulled, the small stem in the end of the grape remains.