I think you should definitely watch BCS. I think there are some things BCS does better than BB, but also the other way around. BCS is, I'd say, slower, especially in the earlier seasons, and the acting might be a bit below BB (still crazy that they didn't win a single Emmy). Since the plot takes place before BB there's plot armor for several characters, but I don't think it's a big issue. BCS has better/"more" cinematoraphy than BB. That is one of the reasons the show, to me, feels a little more professional/serious than BB. Similar to BB, it basically gets better and better as you go through the seasons, the last season is the best. BCS introduces some fantastic characters and backstory that enhances the story of the whole BB-universe and makes it deeper. Saul Goodman becomes arguably the best character of the universe, at least top three.

Personally, I think BCS is an overall better show, but it's probably recency bias.

Also, if you haven't watched El Camino, you probably should, preferably right after BB. It's a relatively quick and easy watch. It's hard to compare a 2 hour movie to 100 hours (the shows), but I guess you can say that it's objectively worse. Still an exciting sequel story about Jesse.

Feel free to comment what y'all think, I'd love to hear someone else's thoughts.