For now I am testing SS 5.2 Gingerbread because of its awesome 'lock in memory' features. I only had 1 random reboot in over 48 hours, and android didn't once kill my music app even while navigating and surfing... good stuff here...I miss MIUI tho...
did you have to mess with any of the performance settings (not just kernel & speed, but VM size, compcache, etc?) Every GB ROM did that "cut off music when going to another app" which completely ruins the experience for me (ps: you @ SB9 - yes or no? me = yes)
strange thing w/ MIUI3.25 -- up until today, it never cut off the tunes, but it started all of a sudden this afternoon (full disclosure: i did not try killing apps or rebooting.) So far, it's froyo MIUI over GB MIUI for me...GB was very buggy on my phone, which is to be expected from a beta anyway, but w/e