I'm breaking a solid year+ of silence/lurking to throw my support behind Vanilla RootBox (4.2.2 AOKP/CM/PA).
The battery life with the included CM kernel has been outstanding, and you literally will not find another ROM that has more custom settings/options than VRB. I've yet to run into any stability issues despite this being a 4.2.2 base, and I really can't say enough about the dev support (fantastic!) I still keep flashing all the major TouchWiz releases (beans, synergy, CM, etc) but I find myself hating the look and options of TW more and more each time.
However...If I needed 100% functionality and stability, and I had no choice but to go with a TW ROM, I really wouldn't look any further than CleanRom. It is as stock, stable, and de-bloated as they come (almost to a fault!)
I love Synergy's innovation - their dedication to research and development digs deeper behind the scenes than just about everyone else - and if "bells & whistles" are what you're looking for, you simply can't go wrong with their ROM's. Unfortunately my GS3 hates Synergy - I literally have no explanation for it, but I've never been able to run their work without major issues.
But I guess that's why they say YMMV, right?