My university offered the math classes in either CS or Math departments. I always chose the math department. Better teachers and far more interesting professors (as people)
Obviously lots of great people have CS backgrounds, but it also feels like "how did this idiot get a degree" happens far more frequently for CS than Math. It's not like everyone coming out of a Math degree is automatically a genius, but they set the bar higher and as a result math classes "feel" better.
I studied CS, psychology and business administration (I dropped out of BA, it was useless info)