Hummmmm i dunno, i like play with Angmar faction, i just love the Witch King and the "summoning" system and stuff. About the hero.....Thank godness they underpowered Gandalf from the BFME I, man he was too overO.o. In this one i prefer the witch king mordor version uppon the angmar one.....still Angmar outfit is my fav:P
i dont like angmars witch king either. Mordors witch king is so much better cuz when he aint mounted he does a lot of damage and dont die as easily as when mounted. Then to cover distance just mount him, but he takes structures out better when mounted.
I generally like elves best as i enjoy hit & run tactics. For my favourite official hero, its got to be either thranduil for his stealth, or Haldir (once levelled-up) for his leadership ability - combine either of them with a couple of groups of Mirkwood Archers and you have a roving squad of stealthy death-dealing
My real favourite hero is a CAH though - female elven archer with vision & power maxed and all the rest of the points in heal rate... THE ultimate scout & harasser.. the archery specialisation skills let you take out buildings in pretty short order and stealth makes for good hit & run abilities. Not much good in close combat, but make sure to have self-healing and whirlwind and you can get out of most trouble pretty quickly. She's also amazing at taking out most heroes & the larger stuff like siege units.