Pre-launch landing page. What works best?

I don't know if I'm all alone on this, but for me #1 is prety near worthless.

It also has almost zero SEO value.

What is your objective?

If it's to test demand for your product, then a one pager with real pricing and CTAs are required.

If it's just to collect emails, then option 2. A coming soon page with zero info isn't likely to convert much cold traffic.

Kind of hard to answer so generally. However, I would consider that giving a little more Info about your product (Version 2) might indicate actual interest in it a little better.

1 if you are building hype elsewhere and simply redirecting them to your landing page.
2 almost always, with careful attention to relevance and conciseness. Detailed information should be stashed away in a link to a different page.