First of all, i like all of them but for personal preference this will be my ranking...and im bored so i did this.
Jean at first she was a solid "D" but after some minutes of playing her "story" was the most entertaining because its the most challeging if you compare her to the others.
Rogue in the other way is the most easy, atleast for me, she is even somehow annoying being so clingy. Not my thing.
Laura and Kitty they are the best without a doubt for a lot of reasons that some of here will know already.
Emma and Storm are great but im not into "giant boobs".
Jubilee, well im into asian woman so she is my weakness.