I've been playing Super Mario Galaxy and working on the Prankster Comet missions (except Purple Comets, which I haven't unlocked yet). I only have two missions left: Cosmic Mario Frosty Race and Sandblast Speed Run. I was curious: If you've played this game which comet mission was your favorite? Mine was Topman Tribe Speed Run because I seemed to just breeze through it on my first try. My least favorite was Lava Spire Daredevil Run because it was really hard not getting hit even once during the whole mission.
If we are just talking original Galaxy then Daredevil Bouldergeist can kiss my ass. That is a mission I never want to do again. If Second Galaxy is included, The Perfect Run can kiss my ass. That is a mission I still have not completed yet and it is the only star I need to 100% Galaxy 2. My favorite Daredevil is the Purple Coin one in Toy Time Galaxy. That one is fun in my opinion. In Galaxy 2, it is the Boss Rush one in Boss Blitz Galaxy. It is just really fun and enjoyable to see the old bosses again.
If you have ever heard of Grandmaster Galaxy in Galaxy 2 it is a mission in there. If you haven't, imagine using every skill used in the game through a brutally long level without being hit ONCE. It is hell.