http://ffxiv.junkiesnation.com/2013/...-2-qa-session/
Q. How are the Binding Coil of Bahamut and Crystal Tower different?
A. Even with the release of patch 2.1, the Binding Coil of Bahamut will be the hardest content in the game. The Crystal Tower will be more casual, as it can also be accessed via the Duty Finder.

I can tell you now, my FC will be making pre-mades regardless.