Since you didn't ask about the AVID, i'll rate the 3 spurs you listed:

1: Kimbrough(light and high quality)
2: JC Silent Speed(Machined teeth, i like the precision. Downside being available sizes and possibly heavier)
3: AE stock spurs(rumors say Kimbrough makes em for AE, but their own are higher quality than the ones they sell AE)

I like Robinson pinions, recently started buying their black anodized aluminum pinions and love em. Less weight and to me, they seem quieter and make a better noise than the steel ones, more of a "Whirring" sound.