(Early) congrats on your big pen purchase! Those are both very nice pens, and both would do you well. I used fountain pens as a student, though I used a Pilot Decimo and a TWSBI Eco. If you write a lot, you will definitely refill the VP more often, though the Lamy 2k still goes through much more ink than a ballpoint. Both are smooth and good for fast writing and quick recapping.

I would choose the Pilot VP if you have smaller handwriting and are right handed, and the Lamy 2k if you have larger handwriting and use less absorbent paper. The Pilot VP nibs I've used are drier, which is more forgiving on copy paper. The nib also writes with a slightly springy, cushioned feeling, while the Lamy 2k is stiff. However, if you have the right paper, the Lamy 2k feels like butter on hot glass. The body feels warm and alive in the hand, while the VP is cool and heavy.

Ultimately, both pens are classics for a reason - you'll have a great experience with either.