Having played P4G, P5R, P3R I would have to say Yu from P4 has to be the best equipped to handle social interactions because he has such a great support system and is not dealing with personal loss or ostracised for any misunderstandings.

I know the plots to 4 and 5. If that's anything to go off of, I feel like this question is asking what my favorite flavor of cardboard is. I'm sure Amazon Prime tastes different than Crushed Fedex, but I don't feel like I've really thought much about my preferences on the matter.