It’s a pretty simple thing, Xbox’s conference showed me way more games I’m excited about and will be buying regardless if it’s 3rd party or not. Considering Sony’s greatest surprise was RE2, the rest we already knew about.
I will say that Ghost of Tsushima is probably my game of E3 though. It looked so good. But if I’m rating conferences as a whole, Xbox easily won by having a solid conference with no awkward moments or sound issues and by showing me more games that I will be buying.