I sometimes prefer real clay bars. Despite a good washing, I have had embedded grit caught in my Griots pad and it scratched my paint. Prob because I did not rinse often enough. That seems to happen less often with a conventional clay bar as grit simply embeds. That glass smooth finish was there afterwards, and a quick buff brought out perfection.
I like the Griots synthetic clay hockey puck enough that I have two of them. But I now know to be careful with them.
Since I park at the airport, my paint gets plenty of damage from particulates. A clay bar is a must.