Yeah, honestly, I'm having a really hard time saying who exactly had the best presentation.
Sony showed the most games, and probably the games with the most polish, but in terms of actual gameplay were very same-y and uninspired (third person action game, third person shooter, first person shooter, first person walking simulator).
Nintendo quite possibly had the worst presentation because they only really showed two games (in their presentation time at least, the treehouse did get around to other releases after the fact but I wasn't watching), but honestly Breath of the Wild was probably the best game showed all event for having more than two core mechanics to it, and I absolutely love how much it's trying to shake off the Ocarina of Time formula.
Microsoft had the most balanced show with a number of games that were actually given screen time and discussion and more gameplay than two character walk through a forest and talking, and honestly I'm really really looking forward to ReCore tho I don't think anyone else is that game gets a solid 2nd place trophy right after Zelda for me, but yeah suffered from too much focus on VR and devoting even more time to Minecraft.
Honestly pretty much every show had some large element that just dragged the whole thing down for me, so I couldn't say anyone had the best presentation or won E3 or anything.