When to use the express template engine and when to use ssr next?

Question

Express.js

Hello!
I'm learning express, react. Decided to write an online store. Everywhere they write that for SEO it is necessary to render the page on the server. To do this, use Next for the front. Question: what is the difference (when to use) the express template engine issuing the finished page and ssr on next. Thank you.

Answer 1

I am a supporter of using https://prerender.io/ for SEO, so the load on the server increases only if the page is requested by a search bot, a regular visitor still takes the load of page formation on himself, and the overhead for the developer is an order of magnitude less