I'm finding it really strange how everyone is referring to the Persona series as being comprised of only two games.
Obviously I know that people must realise that P3 wasn't the first game, it's just odd that people aren't saying "of the only two any of us have played, Persona (3 or 4) is my favourite!" but are instead going more along the lines of, "out of the two Persona games, (3 or 4) is my favourite"
That being said, the first two are VERY different to the second two, and my personal favourite is 3.