Hey Mike. I'm comparing to sabara, red hybrid, an unknown variety, and a few other oddballs. I have not tried Grimal, and am open minded to others kicking ass.
Most grapes suck or are ok to me. But really sweet and sour ones that are crisp can be delightful. Not sure of the specific varieties, but a top notch seedless grape is hard to beat. They come from lands far north of here.
I have tried many grapes over the years, and a few jabo types, and thus far, the best grapes beat the best jabos. However, the worst jabos are better than the worst grapes.
Being that not many grapes fruit well in my area, have happily focused on jabos.