What race/class is best?
None of them. You've got Lothran, mirocu's character who's a dark elf. Buffy, Acadian's character who's a Bosmer. My own Helena who's a Breton.
All of them different races, all different classes, and all very dear to their creator's hearts. And that's just three of us. Any and all combinations work.
My suggestion is to create a character you like the look of, lore etc, and then "listen" to what they tell you abou themselves. This will help determine their birthsign, skills, strengths and weaknesses.