There are a handful of different types of missions, and some are definitely better than others. (switchera.net)
There are over 400 stages to play that include different types of missions (i.e. focusing on one color), various enemies, and difficult boss fights. (crackberry.com)
This gives a lot of reason to complete many different types of missions and their side objectives, as doing so will earn and unlock unique gear. (attackofthefanboy.com)