depends on what you want. with the fks you may have to modify the brake or ride without one, but you get increased flex. the jester and the sth would both work and have the wide toe piece but the real difference there that you need to pick is wether you want spheric release (sth) or no vertical release at all (jester). the fks 155 also has no vertical release. if you've had any kind of knee problem in the past i would definately recommend the sth. also there are weight differences if that matters to you.