Which of these 2 domain names should I use?

http://serverless.page/ - concise and easy to remember (.com is overrated now)

I'd use #1 and try and pick up serverlesspage.com while you're at it, if you can. Because you know people will go there instead.

If you don't think people will end up going to serverlessass.com if you use option #2, you clearly live on a different planet than I do.

I’d say pick #1. The other one reads a bit awkward due to the triple `s`. It’s also possibly prone to be mistyped.

Wile I agree that the triple "sss" is not great and very prone to mis-typing, I'll just add that MOZ recommends avoiding TLDs like .page for SEO reasons.

https://moz.com/learn/seo/domain