It's a toss-up between 9 and 3.

With 9, I'd be functionally immortal. With that kind of time, I could do a lot of good.

With 3, I'd be a genius multi-billionaire. If I (somehow) got to keep the Howard Tayler moral compass, I could accomplish all the good stuff FASTER. https://twitter.com/2ndHandBookery/status/1325498320924635138

I get how comic book movies aren't MEANT to do the full sociopolitical permutations of stuff, but I'll forever be disappointed that Iron Man used his power to smash bad guys instead of establishing a diverse colony of of humans on the Moon.

I mean, he designed a super-efficient drive system, and an ultra-lightweight armor which deflected (among other things) an anti-aircraft round fired from a tank.

That scales into "safe space travel" very quickly.

Cosmic radiation? Yeah, that's a problem when you can't carry enough shielding, but with arc reactors and repulsor drives, you can wrap your ship in its water supply, and you'll be fine.

All the rest of the extremely finicky details of a functioning spacecraft are, of course, extremely finicky, but if Tony Stark can teach a team of robots to build those Iron Man suits, the detail work for a space colony craft is going to fall in line FAST.

Now, Logan and his healing factor...

If I had that, I'd be taking a much longer view of things. After my first lifetime of not dying or aging, I'd invest in a couple of decades of education on things like global finance, and then I'd start investing. Patiently.

Because let's face it: even if they're infinitely reparable, a single pair of fists can only reach so far. Adding claws doesn't help the scaling.

But late 19th-century scrappy investor Logan could be 20th-century billionaire Logan.

"Oh, again with the money. Come ON, Howard."

Yeah, money. I'm sorry. It's just too damned useful to not focus on. And Logan's going to need quite a bit of it to keep his immortality hidden during the late 20th and early 21st century.

Sure, in the real world we don't see billionaire philanthropists actually SAVING THE WORLD. We see them nickel-and-diming (to them) pet projects, and not really offsetting the damage done by all the OTHER billionaires.

And billionaire Logan might figure this out.

It wouldn't make a great comic book, but "Immortal billionaire with spikey hands dismantles capitalism" seems pretty heroic to me.

That might be the ultimate long game for someone who has seen centuries pass. Sort of like an R. Daneel Olivaw, taking steps to tear down a few human institutions in order to allow better ones to evolve in their place.

And in some 23rd-century reveal...
"Logan? Who said YOU deserved to play god with the human race?"
"That was me, bub. About four hundred years ago, when I saw how unfair it was that you kept trying to destroy yourselves, and I was the only one who couldn't die."

So... would I accept the "helmet" deal offered by whatever deity-level agent or principality is extending it?

I'll answer with one of my favorite sayings:

"All I want is the chance to prove to myself that money can't buy happiness."

Oh, and I'd absolutely check the fine print. If there's enough of it, then even if I thought I understood it I'd step away from the deal altogether. I know how monkey paws work.