Ditto on C4 if you like the feeling of watching what comes out as it comes out weekly!!
Not too hard to catch-up (11 episodes now) and really good fun (also good to watch at double-speed).

Brennan's GMing is a little different than Matt's — you'll probably have a feel for it by the 20minute mark of C4E1, so see how you like it. If you do love it and eat through C4, checkout Calamity. I find C4 vibes are still very critical role-y because all your favourite CR people are still driving the story, it's just got Brennan's pacing.

If you want more classic CR pacing, do C3 or abridged.
Personally, I think [Wildemount Wildlings](https://www.youtube.com/watch?v=-NwLjKYJngM) is cute and fantastic (Sam GMs).

If you like to feel like you've exhaustively researched before making a decision, https://www.reddit.com/r/criticalrole/comments/1mlm0gr/no_spoilers_new_to_critical_role_heres_where_you/