The only people who say 3 is the best are contrarians who want to seem unique. I played the games backwards too. Platinumed P5 first, then moved on and did the same for P4G on the PSTV, then I finally moved onto P3 FES via a PS2 simulator on PC. P3 was by far the weakest entry in the modern series (not including the first 2, which I honestly don't even consider Persona games). The dungeons are crap, you can't even control your party members and the AI is shyt, the main cast and story aren't very interesting, and the social links are forgettable at best. It was the only Persona game I didn't replay after I beat it. P5 is objectively the best GAME in the series. The dungeons are leagues ahead of anything in the series until then, the gameplay mechanics are far more polished, and it has the best social links of the series. That being said, as someone who played P5 first, P4G is still my favorite. The dungeons aren't nearly as good P5's, but the main cast, the story, and the music are far superior.