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bibimbap
I used the GR-9 before moving on to the GR-10. Tactile difference is indistinguishable, but if anything the GR-10 is grippier because it's bigger. The extra width makes it easier to get in out of the cages as well. If you have larger than 8.5 UK feet, you'd be better off with the GR-10.
(not my photo)