Sorry, I don't know how to use spoiler tags, so umm if you haven't seen the second vol. of kill bill PLEASE DON'T READ!
I can understand why some of you were frustrated that she killed him in the end, I was too. I think it was because after it got sentimental, and they spent time talking together, it didn't seem that Bill was that bad after all. Also, with the introduction of BeBe, it makes you feel like "does she have to kill him, I mean it could work out" after hearing the entire story, he even said he was sorry and we found out that she broke his heart. So ya, I was a bit depressed too at the end. It was sad in that way, but also you have to understand it still makes for a great ending.
Btw, in the end when she's in the bathroom is she crying or laughing, or both?
And in response to the question of which of the two movies is better, I just think it is one awesome movie altogether.