I just did EBC Red Stuff on my factory rotors. I was around 15K miles on the clock and while I think the consensus is that I should have done rotors as well. I didn't and everything is working just fine. My car (2019 RS%% Sportback) is a daily driver and sees no track time.
Compared to stock, the Red Stuff pads make less brake dust. Also, the factory pads are soft, and I found them to be "grabby" at times. Especially during light braking at slow speeds. The Red Stuff do so much less than the OE pads. Overall stopping power is similar and I don't feel I lost any measurable performance with the Red Stuff. I also can't say I gained any though.
I had PowerStop Z26 on my previous car, a 2016 S6. They do not make Z26 for the RS5 or didn't when I was shopping a few months back. Just Z23. I think they're the same compound but the "backer plate" is different. I liked the Z26 on the S6. They were quiet and didn't grab at all. They also had an objectively tiny amount of brake dust. However, the Red Stuff do perform noticeably better. I remember noticing that I had to press the brake pedal much harder on the S6 after the Z26 were installed. It wasn't to a fault, but definitely noticeable.
I guess the one thing to know here is that, I believe, the EBC Red Stuff pad set I got is really "supposed" to be for an S6. Whatever. It works and I think this is just EBC not really being clear on their catalog. FYI, I got the pads from ECS. But, using that logic, I supposed that since I didn't check to see if the PowerStop Z26 was available for an S5, that they may indeed be. If that's true, you'd have another option.
To summarize, EBC performs better, has less brake dust than stock but has more brake dust than EBC. And I think Red Stuff also costs more. PowerStop (either option) will make less brake dust and probably last longer, but you'll lose some stopping power (think 20%-ish).
-MB
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