I think Wrong Number is better in every way, except maps being too big and enemies shooting you from off screen.
Many people complain about the lack of masks in the sequel, but I prefer the way Dennaton has chosen, the masks, or rather characters, really do make a difference when playing. Who doesn't love some Alex & Ash action? Older masks provided such a small variety in gameplay they were just dull to me.
And Wrong Number has level creator, so there's that.