Klopp, Pep, Mourinho, Simeone, Conte, Zidane, Ancelotti, Low, Mancini and Flick. In no order.
For me, to be the best you need to win something or take a club from the swamps and get them relevant.
Losing a league cup final and a CL final doesnt make Poch a top 10 manager. In my opinion.