Koolstop Salmon.
I got salmon for the front and black for the back, but TBH I'm really disappointed in the black. No stopping power at all. They'll only stop me if I'm doing under 4mph and still take a while at that. (Pads are uncontaminated as are the rims, and the pads are striking the rims correctly and at the right distance.) The bog standard pads that came with the bike were simply light-years ahead in stopping power.
Delighted with the salmons on the front wheel though - excellent performance, even in the wet.