Sony has published amazing games on PS3 and PS4 unrivalled by the competition. Spiderman, Infamous series, God of War 3 and God of War, The Last of Us, Resistance series, Killzone 2 and 3, Gran Turismo 6 and Sport, Horizon Zero Dawn are fucking brilliant. The competition has nothing on Sony though they have a few amazing games as well, overall their lineup pales compared to Sony. But Microsoft is turning the tables with its new first party studios.
Microsoft has acquired Ninja Theory, developers of hack and slash game DMC: Devil May Cry which had phenomenal combat, Playground Games who developed two best arcade racing games of all time Forza Horizon 3 and 4 and Obsidian who have a reputation for making amazing RPGs though I haven't played any of their games. Sony will have a difficult time next gen and they got to play their cards right. Studio acquisitions are likely because Sony promised in their fiscal report that they will focus more on in house product development.
The developers Sony has are not enough to counter Microsoft's existing and new teams together and Nintendo's growing presence in the home console space with the Switch. Which studio do you want them to buy? There are a number of them Sony should buy such as Platinum Games, From Software which is my favourite developer and Codemasters for racing games.