I used BB whites and Schuey Yellows at the MK GP last year. It was my first indoor meeting, so I'm not much of a judge, but here are my thoughts:
BB worked straight out of the package, where as the Schuey yellows seem to need time to bed in.
BB seem to have slightly more grip, and as Darren says it lasts until the tyres are shot.
BB seem to wear faster, probably as they are softer.
I preferred the BB's as I could be more consistent, which ultimately is what I need.
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