It's an interesting question, whilst I'm a Nintendo fan first and foremost, I've owned every Sony console (bar the PSP), but the games I've played on each one have been different for the most part. I'll likely get a PS4, and if history repeats itself for a fourth time I'll be buying it for a totally different set of games, which I naturally know nothing about right now.
Sony certainly have variety, but I wouldn't say that is exclusive to them. Nintendo have plenty of variety as well, and there are franchises from both that I love, and there are those that I hate from both as well. The difference is that the Sony ones may only last for a generation or two at a time, whereas the Nintendo ones are like a big list that has a few additions each time. What can be said is that Sony keep the quality levels high despite the franchises virtually being refreshed each time, which when you think about it, is pretty impressive.
What I would say is that when we move between generations and I come to buy the next Sony console, I may not know what games I'll be buying for the console, but I'll be fairly certain that they will be of a high level of quality as before.
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