Curious if React folks here have strong thoughts on SSR vs. SPA?

Right up my alley

1/ 

Initial page load html should probably always be from SSR/ISR/SSG because it's considerably faster than sending 150kb+ JS client bundles that need to be downloaded and run. For SEO one of SSR/ISR/SSG is crucial as well as most crawlers in practice don't wait on CSR

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2/

Once the initial page load has been done on the server, hydrated to the client, and the user presses a link, navigation can be done either client side or server side again. Here it's a closer call & there is some allure in the simplicity of server side like remix does.

3/

Client side navigation is generally faster (https://nextjs.org/learn/basics/navigate-between-pages/client-side) and allows for transition animations and not introduce user input delay on navigation. With newer tech like prefetching and bundle chunk splitting, client side navigation is just getting better & better

do you know if there is anyway to do this in Remix? or do you have to use Next.js

I'm not an expert at Remix, but in my impression what it does is client side navigation but with server side loading of just what html/data is needed at navigation time instead of running a big JS bundle client side