I have tried all three types of the Rico GC reeds. I haven't tried the Reserve which are supposed to be very good too. I can't really describe the differences since I don't remember the specifics, but all three of the GC reeds are very good imo. The shape of the end of the reed is much rounder than Vandorens (and I don't know what this means). If I remember correct, both Evolution and Thick are the same thickness and I think the regulars are thinner, but I'm not sure. I would try all of them if I were you to see what you prefer and if you notice a difference.