Xbox by a pretty large margin. I'm noticing that a lot of people are simply saying "Nintendo" out of spite because they hate Xbox, but if you simply sit and compare the two, Xbox definitely put on more of a "show" and focused on making sure people were seeing the value in their Game Pass ecosystem and Xbox+PC ecosystem. They also embraced another meme with the Xbox Series X mini fridge lol
I've not seen one person say they hate Xbox. What I've seen is people who have a Nintendo Switch saying they preferred Nintendo's conference and that's fine.
Honestly, Nintendo & Microsoft had about equally awesome presentations for different reasons and for the most part both companies managed to deliver on quite a few things their fans want.