Well, i didnt saw Xanadi in action yet, but with Pan u did a great progress i guess. Razs Macros helped too for sure.
I think Pan it is your "heart" decision which character u want to use mostly
We dont have some speciel needs of some class or character so just use char mostly which u enjoy to play. We have many friends out of our guild which have many profesions and skills so if we want some specific class in raid or dungeon we just whisper him and its done
If you want to focus only on one, then choose is yours, but if you like to play with both ( three ) Then why not ? Our guild is builded like this style of playing