I think it is difficult not to compare with the other Jun Watanabe's work that I read before this one here, which I'm trying my best no to but sometimes it's inevitable.
Montage is more complicated, complex than the other one. Have so many characters (names) which mades so many difficult to remember and put the pieces together and have a main plot that is really REALLY more complex than the other series by Watanabe.
Doesn't mean that I'm not liking it. I am though I sometimes see myself lost in the story.