The order I played in is kinda goofy. But I started with Persona 5 on Ps4 and got past the first dungeon before my ps4 died.
I gave up on Persona 5 but when smt iii came to the switch I thought I’d give it a try and I fell in love with it. Became a huge smt fan with my favorite probably being IV or then first Devil survivor. Currently playing P4G on my Vita.
I actually started with the original Shin Megami Tensei on the SNES. For a time I was into Famicom and Super Famicom games that never got localized. After I played that I went on to play some of the more popular games in the series.