https://carrd.co/ is your friend here
If the objective of a landing page is to reach the largest audience possible in a sustainable, fast and efficient way, I wouldn't choose any SPA solution. And I must add that this comes from experience. For few years I did try to go the SPA way, with server side rendering, but the extra work and overheads are just not worth it.
IMHO, nothing beats static pages for landings.
I dunno. This means you're excluding people who disable JS from your audience. I'm going to stick out my neck a suggest that they're probably very few and very unlikely to spend money on your product (my bias)
> extra work and overheads are just not worth it.
I'd say the other way around, this tool will get you a fast, single page site in shorter time than it will take for you to decide which static site generator to use (I'm being facetious)
And once you get the hang of it, it takes less than 15 minutes.