Plexweb 4.83.2 and plexserver 4.76.1, any major differences besides the updated logo and ui?

You can look that up right tin the release notes.

Usually there’s no need to stick with the bundled version except for e.g. setting up a new Plex Media Server or linking it to your account (and maybe a few technical restrictions where using the hosted version of Plex Web cannot properly connect to your server).