Depends. If you go to the track, I think a removable bridge and the availability of parts is what sets most kits apart from others. So Stop tech would be at the top of my list followed by Brembo.
I like the AP Racing and PFC kits but I don't think parts are as common as the ST and Brembo's.
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red