I liked the second act of Cinderella much better. The first act bored me right up until "Impossible." So, I guess it's more like the second half of the first act and the second act...
I agree with Into the Woods having a better second act, but completely disagree with SITP. I've always found I cared much more about Georges than George. Not really sure why. Sometimes when I watch the DVD I just watch the first act, and then skip to Move On. (I'm a terrible person, so sue me).
Also, I should point out that the first time I saw Into the Woods was on netflix, and when act 1 was ending, I thought "wow, that was a short musical!"
"Nice is different than good."