Agree with Ben here. Marketing site is for SEO and building persona-specific landing pages, among other marketing-specific purposes. So whatever you use to accomplish those goals is A-OK.

Since you're in Rails land, any method you'd use to render HTML is probably good.

I'm a Laravel guy, and for mine I use a combination of FilamentPHP + Folio + some hand-written data models to create a very simplistic blog. It gets deployed the same as my app server since it's part of the app.