My favourite ROM is the PACMAN-based ones (Stunner2, ReVolt. So its a CM-ROM power features with the customizations from AOKP, and the Per App features of Paranoid.

However, I'm sticking to The Ultimate ROM, which is a Custom 4.1.2 TouchWizz based-ROM. It's better than PACMAN for:
- Phone App (I like the combined Contacts feature, and the swipe to Call/SMS)
- Messages App (landscape view splits the Inbox on LHS and the message on RHS)
- SamsungDive! (locate your lost/stolen phone)
- USB-OTG works without tinkering (not always true for AOSP roms)
- Camera works nicely (AOSP kernel has bad implementation/grainy photos)
- MultiWindow

What the PACMAN is better at:
- User Interface (the HOLO theme throughout just looks sharp and smart)
- Power controls (though the TW kernel seems to hold its own for the most part)
- Notifications Bar (though TW isn't that bad)
- Notifications Shade (though TW isn't that bad)
- Theming
- Transitions
- Browser (TW browser sucks, literally)
- Lockscreen (but I use Pattern code, so its equal with TW here)

....as you can see the benefits far out weigh the downfalls, so I'm sticking to TW-ROM (until a MultiWindow port is achieved to AOSP)