Its the manner of the defeats - no fight, no tempo, no defensive cohesion, no leadership, no plan b etc
Klopp would be my choice, he has experience in europe, is young and has probably taken Dortmund as far as he can. He also has an eye for a player.
Klopp will also know the European market inside out, if he could bring in Reus and a couple of others so much the better.
We need a manager who can now come in and build a team, Klopp has done this. He will also be supported financially and at a club who do not sell their best players to their rivals but go out and try to sign them
It could be a perfect match