I don't think anyone would argue this point that Sony is leaps and bounds ahead of Microsoft in terms of IPs. That is part of their MO. Microsoft tried a different strategy to circumvent this and it was successful, which was getting all of the third party IPs Sony was most known for and bringing them over. MS doesn't even own many of the IPs they helped popularize this generation, like Gears of War and Mass Effect, and many of the ones they do own in part or in full they don't even do much with. This is as close to a fact as anything opinion based can be.