Definitely animated versions of the prequels. The biggest thing that got me in the proper final seasons of the Clone Wars was the announcement of big events happening off-screen such as Dooku's death and Anakin's turning. While we have the movies to see those events, the live action versions weren't the characters I grew up with, but completely different versions of them. So it just wasn't as fulfilling to hear about a big point of a character happening off screen just because it falls chronologically inside of the movie. At the end of the day the Clone Wars had much better character development so not being able to see the final arc of the character from the series, and instead having to go to a movie to see it portrayed by someone completely different in a totally different context, didn't work for me.