I assume that a page builder is a kind of extension intended to build pages in terms of appearance and style.
On the other side, a template framework is a tool that allows us to modify template, which for me is very similar to the purpose of a page builder.
I am obviously missing something; what is the difference between these two?
Template framework is a single home structure, and Page Builder is like a room inside. Each room can look different, but they still will be inside that home.
Template framework: it's a Layout Manager for module positions and to maintain Header, logo, color, fonts.
Page builder: Page Builder is a component - it means that operates only in the component area, like any other component. It has its own add-ons like: Tab, Accordion, Pricing Table, Team, Testimonial etc. which you can place on the Page Layout.
My suggestion is Install Helix Ultimate quickstart pack. You can test both Helix Ultimate Framework and SP Page Builder. It's totally free. Follow their documentation it's too easy to maintain.
This allows you to build pages and each one can be different. For example, page specific modules, permissions, styling, and so on. Page builders focus more on the structure and content of the page.
The template is the overall design of your site so it's more generic and will normally apply any changes you make globally. These frameworks however do vary and some may allow page specific changes. Due to the fact they're aimed more at your global site, they'll also include other sets of tools for compiling, compression, colour changes, etc. Template frameworks focus on the structure and styling of your site.
