Clone Wars is very choppy. Some episodes are absolutely fantastic and some are honestly boring.
Rebels IMO is the best show that's been made - consistently good with great characters. Season 2 finale (Twilight of the Apprentice) is IMO the best thing that's been made in Star Wars for a while... but that said, it will hit a lot less if you haven't seen Clone Wars.
Totally agree on the S2 finale. However, while a bit more consistent than Clone Wars, I also thought Rebels was fairly choppy as well. I think some of that is inevitable with how many episodes they made of both series. I also still don’t love the Ezra character and that played a big part in holding my love back some. I still after all the seasons find him annoying at times. Kanan was amazing throughout though. I’m in the process of rewatching all the Clone Wars seasons again in a lead-up to watching the final season.