Pick Nuxt for
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Deployment portability
Nitro presets target a dozen platforms from the same codebase. Stacks targets infrastructure you own (Hetzner, AWS, or any box over SSH) and that is the path it is good at.
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The module registry
Hundreds of maintained modules, and layers let a team share configuration across projects. Nothing in Stacks matches that breadth of community add-ons.
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Vue
If your team writes Vue, single-file components, the composition API, and the devtools are a real productivity story. STX reads Vue-style template syntax, but it is not Vue, and Vue component libraries do not run in it.
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Content and SEO tooling
Nuxt Content and the SEO modules are mature and well travelled for documentation and marketing sites.