I'm' frankly answering this question because of a personal dislike for any legitimate, relevant question going unanswered. No expertise, but my thoughts and such applying only to the aesthetics of the gun 'presentation' resulting. 'If', the metal was yet nice, the red pad would seem attractive. The metal isn't . I'd not fret between brown and black too much. More important if fit correctly. I'd just go for the Decelerator. But your gun, your choice.
Just my take!
Best!
John