Is this for overall Android Developer or Rom Developer. Your title is too general and Xeu is a god among Developers, but does not make Roms unless you count the base for Dark Edge. I voted for him, but if what you are asking is which is my favorite Rom Developer at the moment, it would have to be JRummy.
Woodyman's!! I like the do it right approach that he takes. He's not usually the first to release the newest thing, but its always stable and smooth. And the crew he put together is top notch, believe me we try our hardest to break our phones, so you don't.:beer2: