Bloxx when the grind is fresh, than switch to CRM when the grind is dead to get many more hours riding out of every grind.
Bloxx have been very odd for me. Sometimes they work super well, with loads of bite and hold, while other days they hardly grab at all, but still hold well. Other days, they squeak loads and bite really well, but don't hold well at all.
CRM pads have been more 'consistent' to me.. Same performance at all times, but a little softer to the touch. Worse wet and mud performance than the bloxx.
Right now I'm using one CRM and one brown bloxx. One of my bloxx is too thin to be used with my frame and rim, so I have to use a CRM there while I wait 'til I get new pads.
I'd personally get bloxx.