I dig with Powdered Water about them both being very good on their own respect.
Willy Wonka and the Chocolate Factory
For one, this kept original look, which I think suits him. What they did that I really enjoyed with this film was make Willy a go-lucky chocolatier, singing and walking with his cane in his hand, singing, and he had that wonderful twinkle in his eye that I think Roald Dahl was trying to portray. Along with that, they kept Charlie's blonde hair, and made him the modest little guy that everyone feels for and loves. The singing is a great touch, that can certainly bring it, in a certain sense, above his predecessor. Things may have been altered, and even from the original setup of the story itself, it floats.
Charlie and the Chocolate Factory
They kept the name, which I always thought was a better one to start. It is still very cute, and much more visually enticing than the original. Though it lacked in the singing, I think that the story of the characters (esp. the children) was laid out and portrayed in a better manner. The poorness of the Buckets I thought was somewhat more accurate, and though Charlie does not have the intended haircolor, he shapes the part perfectly. As for Willy, he is definitely the same giddy guy, but in this one he is more giggly and insane than insane with that touch of the fatherly figure and the twinkle in his eye. I found the music to be more entertaining than the repetitive "oompa loompa" thing, and it made for much better of an entertainment atmosphere.
I feel the second lacks in the feel-good humor and heartfelt message of being humble and thinking of others before oneself. It was more focused around a funny and hyper type of hilarity and Depp's constant antics and giggling. Depp's Willy leans more towards the fun and wacky side, whereas Wilder's leans more to the wacky and sarcastic friendly old coot (not in the literal sense). In their own way they are both genius, and both have their own type of enjoyable eccentricity. I like them both as much, for these you come to like, not exactly in the same way, but pertaining to their own type. It isn't always easy to compare with things that differ so much.
I'm guessing this might be too much ranting. Sorry about that.