In general I have to say so far Big Sur appears to be less quirky for me that Catalina ever was. No more Spotlight maxing out the CPU or rogue CalendarAgent activity. I’m not sure the looks have won me over yet, but in my limited experience so far I’d say it feels like the more stable macOS. I’ll feel even better when SuperDuper can create bootable clones. CCC already does AFAIK.