Depends if there is a directive he needs to follow (or restrict by, take your choice).
My list of four:
Cooper - known and experienced, maybe limited but has also worked well with young players. Could just need a bit of direction and support.
Rohl - done well with little budget, has pedigree coaching, potential to grow.
Jaissle - was part of red bull, pragmatist but likes fullbacks to attack as well as press. In last year of contract with Al-Ahli.
Terzić - wild card. Progressed through Dortmund backroom, not currently in a job, prefers possession but has shown pragmatism when needed.