All of them. JTHJ was affected much more than it should have been by its clash with SOS. Talaash was sandwiched between already released SOS and JTHJ and the to-be-released Khiladi 786 and Dabangg 2. Jai Ho had nothing except Salman Khan. Poor music, new actress, flop director etc. But it got free release and 2 weeks free run.
So Jai Ho is the biggest underperformer of the three, followed by Talaash and then JTHJ.