I prefer the original by Jeff Beal because it is light and comical, setting the scene for a comedy about a tragically flawed detective.
The new theme is too chaotic and heavy... too serious and reflects Monk's dysfunction and delusion. The show needs a tone lightener especially at the end. It tells the viewer's emotions that this was all in good fun.
My wife is a psych nurse and the show is her favorite, especially the shrink sessions. She actually sees patients like Adrian.
but that's another story.