Xbox by far. They showed a lot more games I want to play. Halo looks like a lot of fun, technical issues aside, I'm interested in hearing more about Fable, that's always been a series I've spent a lot of time with. STALKER looks good, that Obsidian RPG looks cool, Everwild looks incredible, overall it was an impressive show as far as games went. They showed a lot and had a bunch of variety.
The only game that really stood out to me at Sony's show was Spiderman, and with it being a smaller title than the first it's not really a title that screams "day 1!" for me. Overall I thought their showing was very weak, and there's no reason to really rush out and buy a PS5.
That being said, if the intention of these shows is to sell you on next gen consoles, both failed at that because I'll just be playing the Xbox games on PC and waiting for a (hopefully) redesigned PS5, because that thing looks ugly and I don't want it under my TV.