Just wondering.. How would you classify Sony's first party support as very strong? Yes, they may have a large capacity for first-party content, but so far Sony exclusives don't really push their systems the same way they do on Nintendo consoles. I wouldn't put Sony on the same level as Microsoft's 1st party obviously, but they're definitely not as strong as Nintendo.
First party category for sony was based on there number of new ip's each gen and the diversity of there gaming library. There exclusives are pretty good too.