V12 is a Sammy ROM
V1 is AndyX's first AOKP ROM
Sorted.
There are many great features in CM9/AOSP/AOKP ROMs. They are far more configurable and have some very nice features compared to Sammy ROMs. However, there are still quite a few Sammy features that you will miss which may well make you return to v12 or another Sammy ROM. Radio is one that many miss, but I miss the Dialer,contacts, alarm clock and camera. The Sammy versions of these are a lot better.
This AndyX is IMM76I based, as is Dragon+Hydrogen currently. With the release of the next AOKP build, Dragon+Hydrog3n will soon be incorporating the many great new features allowing you to install Themes, apps, kernels, modems, effects, tablet mode (basically a CheckROM type Kitchen) Having said all this, I've been on Dragon (AOKP) for a good few days now, and really liking it. I will definitely put on Hydrog3n when the new imminent version comes out.
Ultimately I will more than likely return to CheckROM+Jkay in June, as JKay basically gives all these great AOKP/CM9 type features to Sammy ROMs giving the best of both worlds.