Not many AAA multiplats will sell better on Playstation than God of War Ragnarok if it lives up to the hype. I don't think even Elden Ring can do it (lifetime). GTA6 on the other hand may sell more on PS5 than any non-mass-bundled console game in history on an individual platform, excluding maybe MK8DX. Assuming Microsoft doesn't pay for timed exclusivity.
I think PS5 hardware sales will peak in FY 2024, the year GTA6 gets released. PS4 didn't get a native GTA game.