That is a deep question. Since the massive re-vamp of DDO I was defaulted to the Kyber server. I dunno' if there is a way around playing on that server or not.
And for the character class/race that is like comparing apples to oranges. It all depends on your play style. I like playing a healer myself... which seems to be the most undesirable but at the same time, often... the most valued member of a team.
I wish you the best on figuring out what your favorite class/race is to play.