I wouldnt think about bootup time and overall responsiveness in terms of 020/030.
Im thinking about giving AROS a try, and its mostly cause I WILL purchase the A1200 Vampire whenever its out.
The Vampire will add "tons" of new classic enviroment users with 128 megabytes of ram and 060++++ level performance.
For both OS 3.9 and AROS, the people making addon packs can scale accordingly.
Ofcourse, Amigans are inherently allergic to bloatware, but some performance impact is impossible to avoid if you add more "modern" functionality.