This is tough because Sony's franchises are so inconsistent.
If Ico/Shadow of the Colossus counts as a spiritual series, I might pick that.
Wipeout is ineligible as it's been on Sega and Nintendo systems.
Ratchet & Clank is up there too, and I haven't even played all of the games. God of War, too. Basically a bunch of stuff that started on PS2 is up there - that was the golden age of Sony first-party software.










