I went through this a couple of months ago. Going from stock Shimano 4 piston metallic pads, I wanted to want Galfer or MTX, but they are not cheap.
I kept coming across consistent recommendations for Truckerco pads. For $19 for 2 pairs of the semi metallics, it seemed like worth a try. No night and day differences to the Shimanos for me, and I’ve been happy with them so far.
As it’s worked out, I’m switching mine to Galfer Standards. Turns out that they’re $19/set from Jenson and it’s the Pros that are $34.
For reasons, I’m taking my bike to a lift served park this weekend and relying on budget pads doesn’t seem like a great idea. As decent as they’ve been on my local trails.