PS3 has a far better third-party library in quantity and quality (most important). I don't know if I can say the PS3 has better first-party games. Even with the Wii U not having one of the stronger Nintendo first-party line-ups, it still rivals a lot of first-party lineups.
PS3 also is a multimedia juggernaut and has more robust online.
So, I will say PS3, even though I played the Wii U more overall and when it was a current platform. PS3 has almost always been about 15 years after the darn thing came out.
Lifetime Sales Predictions
Switch: 144 million (was 73, then 96, then 113 million, then 125 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima