Musk and Page and Bezos all present with a bit of giddy schoolboy energy. It's clear they are all super excited to be building the future and can't wait to tell you about their cool new tech. They aren't polished presenters, but it doesn't matter.

Cook and Nadella are both very polished and calm, but still manage to convey a lot of excitement about their companies.

That leaves Zuckerberg and Pichai, who are, in my view, too flat and robotic.