Which charcters do people prefer?
I've never used Khalida, as we have an agreement with the players I play with about certain characters, If I was to use her, Teclis and Balthazar Gelt would be playing against me.
That being said, Rhamotep, I used him in a game a few months back and have never looked back.
Run him with my tomb guard, and they just run through units like a train. Halberds, re rolling hits, str 5, extra attack with frenzy and with a king or princes WS they are mini monsters.
So he is the only character I always use.
I just love the tragedy and righteous fury of Khalida's backstory, and being an Ork player in 40K, the idea of a character that can increase Ballistic Skill is just MMMMMMmmmm...