I’m currently doing a Galaxy Ace ROM compare. This will be a brief comparison for only a few ROMs (can’t live too long without my Galaxy S2).
Here’s the list:
Unofficial CM9 beta 9 from Maclaw Studios
SGSII v9 (ICS based)
Official CM7 (yet to determine which nightly)
and if time allows: latest stock ROM
Let me know if you have a good (decent speed, decent battery life) ROM that you think I should include. The results will be out in about a week or so.