I have tried both CRM plaz, yella Bloxx and brown Bloxx. Personally i prefer the Plazmatic CRM pads, being a comp rider i always want to know when my brake is working, this is shown by the squeeky noise given off with a grind. The Koxx Bloxx did not create this noise and seemed not to grip as much as the CRM pads.
CHOOSE PLAZMATICS
You cant go wrong with them and they look better too. Bloxx look like POO.
Chris