If it had to be one I think I'd send Musk. Bill Gates is kind of a spent force, he's in his "be philanthropic to make up for all the shady shit I did", so I think he's done most of the harm he's going to do. Bezos is a close second pick, but I think he's less actively bonkers than Musk. Zuckerberg I think is an alien anyway so they probably wouldn't take him.
Zuck. He would negotiate a deal with those aliens. We would live, but we would have to stop using toilets, instead mailing our shit in plastic bags to some kind of central processing plant. Then a few years down the line we would find out that the aliens didn't ask for this and it was a clause added into the deal by Zuckerberg.
I'd hope that the aliens would view him as alien enough to assume that we'd already been invaded and either 1) no need to re invade us for fear of starting war with some unknown alien civilization or 2) liberate us from the rest of the rich people who look more like people than zuck.
Bill gates has a surprising amount of evil mastermind energy. I would trust him to make the best plan to organize and rule humanity. Aliens would then just cut him out oft he loop.
Bezos is I think an otherwise normal guy, if he wasn't rich he would probably just be like a shifty insurance salesmen. So nothing intresting
It would be fascinating to see aliens call Musk out on his bs and watch him be forced to come to terms with it but I think it is so pathological he probably couldn't.
Zucc, would just be a cryptographic bro. He was just in the right place at the right time really nothing thst special about him.
For my money, you either send Sakurai, the creator of Super Smash Bros, the voice actor for Spongebob, or Pokimane. If none of them are available, I got em.