Guy or Ellie will have to correct me if I'm wrong, but I think natural, natural brown and brown canvas are all the same thing. In one form or another that is available for every knife.
Accepted knowledge says canvas is the grippiest/most textured followed by linen and then G10. Guy did say somewhere that he usually avoids G10, but prefers linen on most knives.
To me S! micarta is on the smoother side compared to some other brands. Canvas has texture and definitely grips. The linen doesn't have bumps or grooves that you can feel when rubbing your finger tips on it, but when you grab or squeeze it, it definitely is grippy. G10 itself will be less textured, but remember that the handles are nicely contoured. Some people have been really happy with orange G10 on their GSO 10's.
