For candids I use the 85mm/1.8 and 50mm/1.4 most, because I like a very shallow DOF. I'll sometimes use my cheapo 22-55mm zoom if I want a wide angle.
For formals, I still use film and shoot on medium format, usually at around 85mm, which is about 50mm for 35mm film cameras (or "full-frame" digitals). It's wide enough that I don't have to step back into the next county, but it's not so wide that things distort. If I were shooting formals on 35mm, I would use a 50mm for the same reason. It's just more natural looking.
Though I don't really do weddings any more.