Spurs got lucky when they got Poch. Wasn't Levy after LVG when Woodward lured him to Old trafford with his Disneyland themed presentation. Had united not done that, Poch might still be at Southampton. He is a fine manager and he was doing a good job even at Southampton with whatever resources he had. His side were always difficult to beat and with better quality team at Spurs, he has really flourished and receiving accolades he deserves.
I am pretty sure had he made switch to United this summer, he would have brought United back on track in a year or two.
As for Ole, you cannot associate his teams with particular style of play. Like Klopp's gegenpressing or Pep's possession based football, do we know how Ole's team likes to plays? Ole is a good guy, understands the club, says right things but can he build the team from scratch and make united competitive again, only time will tell.