There are many differences in Charlie and the Chocolate Factory and Willy Wonka. In, Willy Wonka, Willy Wonka is much more confident and less energetic. In Charlie, Willy Wonka is much more rude to the kids saying things like "stop mummering" to Mike TV. Also in the Willy Wonka, he is more insecure and tries to make a big show to hide it such as when he greeted the kids at the door. The back-story and family story allows Wonka to be a dynamic character making him more interesting.
Vercua's Dad, Mr. Salt, is very different in the two movies. Mr.Salt in the old movie is a wuss, and is almost controled by Vercua, However in the Newer movie, he has spine sawing things like "all your getting today is a bath." He also doesn't make excuses to Vercua.
I liked the newer movie better because the quality of it was better. The actors were better. Also it was visually better. I liked the back story of Willy Wonka because it make him a more interesting character.