Those are the two that generated the biggest and arguably most critical exponential leaps in console gaming. I suppose the PS1 is debatable with the PS2 for some but I say it’s inarguable aside from a linear cause & effect argument.

The PS2 made game consoles as a home entertainment hub for the entire family a reality. That’s what proved the idea that the console was no longer a mere toy for kids or enthusiast adults, but for everyone in the home, turning consoles into a much more practical family purchase and helping reduce the stigma associated with gaming as it drew more and more adults into gaming as a casual affair. To that end I think the broader seismic shifts caused by the PS2 far outweigh those of the PS1.