So far, probably Cherry/GMK profile. I've got Blank PBT keycaps in Cherry profile on my KC60, and they're awesome.
Yeah, as far as im concerned Cherry profile caps especially GMK's are the bomb but i havent actually tried/tested/compared those with PBT or other ABS keycaps, but i definitely need a set, you could check out the [IC] i have on my signature
I LOVE SA! i would love to try DSA one day.
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Do you have SA keycaps? they look pretty awesome to me on any angle and they actually feel pretty solid compared to thicker PBT caps, but unfortunately they are a bit too tall/high for my preference.
I do however have DSA caps which looks nice (spherical like SA) and feel nice (PBT Granite) but are significantly thin compared to any other keycap out there. Well as I've read from SP's FAQs, it is because at that time when they were making the molds for DSA/SA keysets they wanted to decrease cost by making the walls of the caps thinner but doesnt affect the overall structure of the keycap.