Sony has more ongoing relationships with companies and a longer history. I do think MS had exclusives in older generations, Sony maximized their and MS let theirs wither. Fable 1 and 2 were amazing. Then 3 puked on the previous games and MS messed up Lionhead. Halo was great then fizzled out. Sony was on their game and kept the exclusives going strong. Now MS is buying up studios and backing them more. But game development is slow. And with covid it got slowerer which showed how far behind MS was with their development.