Is there any advantage to request a in-person interview over a Skype one?
From my experience going in person is the better choice:


They will see you as very motivated and you show that you really want
that position and you are not just doing a quick skype interview (and
on the same day 3 other ones)
Personal empathy can develop much better in person than via skype
Your explanations will be much clearer e.g. using a white board etc
to explain


So, if you have the possibility then go in person!