Playstation fan base is a lot more diverse than Xbox's.
Xbox can sell 100 million units but only 1% are interested in a certain type of games. Playstation can sell 20 million units but 10% are interested in those type of games. Even if the totals are similar like previous generation., games that fit European or Japanese sales will always sell better on PS. Even within the US or UK, PS fans are still a lot more diverse.
That is the reason why it is much harder for Microsoft to come up with successful new IP and build a new franchise around it.









