I’m another who likes the unfrosted kind best. Unfrosted cherry & unfrosted cinnamon. I haven’t seen an unforsted cherry in years, though. And even the unfrosted cinnamon are harder to find than they used to be.
I’ve never had a grape PopTart. I wouldn’t mind trying one (even frosted), but not that Wild Grape variety – that neon green color does not belong on food.