All the pens I use are ballpoint.There's nothing stopping you from using a fountain pen, and if you prefer then go for it. In my experience though I've found that sitting in a lecture, you take notes quite quickly, so a fountain pen may not be the most useful for this situation. But say you're writing up your notes or creating some sort of study aid, if you want it to look nice then sure.Any formal writing that you'll have to do will almost certainly be electronic (most likely either Word or Latex)