Superstar kevlar still my favourites- it’s good that they’re cheap but they’ve also been really good. Discobrakes I found a bit shortlived and less powerful than I’d expect from sintered.
I’ve only tried the uberbike racematrixes, they worked really well for a couple of easy UK trailcentre rides then shat the bed completely in the alps, they seem to have no tolerance for heat- went dangerously unpredictable, then went in the bin. Wasn’t inspired to try their others!
Some OEM pads are worth it- Hope are the standout imo, they’re expensive but they perform well, last very well. Formula, Avid and Shimano oem, not worth it imo, just ordinary but expensive.