WordPress is already very SEO-friendly with schema structures. From what I understand, WP is a good solution for a landing page with blog as long as your AJAX calls are not SEO-relevant (since these are not server-side rendered). Then jQuery is perfect. It will be an almost impossible act to put VueJS on top of WP because:

1. WP prerenders all templates server-side, so you would have to re-do the backend architecture entirely.
2. VueJS is not SEO-friendly for data that needs to be fetched from the server. You may want to look into NuxtJS which is a server-side rendered framework on top of VueJS. But then you are completely out of the WP universe.