A tie between early PS3 and PS5.
But PS3 rebounded after about 2 years. When I look at my PS3 collection, it wasn't so bad. There were many genres covered, and many games came out in rapid succession. Entire trilogies of Uncharted, Resistance, Ratchet, Motorstorm on top of third party stuff like Mass Effect, Dead Space and Souls. Multiple TES and Fallout games. And I see games like NBA Street, Virtua Tennis, Sega Rally and Ridge Racer, franchises which are pretty much dead nowadays.
PS3 had free online and I had a blast with Warhawk, Killzone 2, MW1, Motorstorm PR and Bad Company 2 to name a few. I played much more than now, which is also because of more spare time but games were far cheaper. I would often search bargain bins and bought games a few months down the line for 10 bucks.
PS5 has good games, but its really a few. Returnal and DeS are 4-5 years old. Astro Bot was great. There are some good games on the horizon but the PS5 is turning 5 this year. Remember the amount of quality games being released by 2011 on the PS3 and 360.