I voted PS2, of course, but a lot of comments also are not very appreciative of PS3, even PS4 and such. PS2 does not need introduction but PS3 still gave stuff like Nier (Gestalt/Replicant), continuation of Suda51's weird games, more Way of the Samurai after PS2, a lot of weird and even weeby JRPG's, with Xbox 360 arguably a golden re-age of fighting games that still is not quite like it used to be since then, as digital distribution made companies re-release classics from last generation like Marvel vs. Capcom 2, Jojo's Bizarre Adventure, Street Fighter 3rd strike and Guilty Gear Accent Core Plus (later with +R as a free update) and many more that would some disappear and take years, almost decade to be officially available again. PS3 was a slowly built up generation of good stuff in it's own right, though the multi-platform focus and PS3 being initially weaker in those titles makes the identity meld to background, though there was great, if not last great Naughty Dog games on PS3, with Last of Us being universally more acclaimed than it's follow up, same going for Uncharted trilogy versus it's last game on PS4. Also, while cheating, I think HD releases were also in their stride on PS3, especially Metal Gear Solid collection which plays "as it should" with official DualShock 3 controllers on PS3 compared to any other versions of the games.
There is same to be said for PS1 as well, for sure, but most people know that, and with PS4 though even for me, with the console and somewhat expansive library, cannot say much of it's exclusives or semi exclusives and even few of them leave a bitter taste in my mouth. I got to experience both Death Stranding and Days Gone on PS4 pro which was great time, but Sony being Sony killed off follow up for Days Gone leaves a bad taste in my mouth. I quite enjoyed that game in it's entirety.
Generally multi platform has ripped identity of gaming consoles, though many of "PS2 greatest games" are also such, like GTA games, even Silent Hill 2, but most people would agree things were quite different with Xbox 360 generation and onward.