Simeone has been heavily backed by Atleti, he's the highest paid manager in the game and has complete control of the entire club. Pochettino took a perpetual disappointment of a club and got closer to anything they've ever done in most fans life time, while not being backed by a chairman who decided he had enough 'good' players and built a stadium instead. I agree, he's a good manager, not world class but then again he's hardly been given the opportunity to prove that in the last couple of years. As things currently stand, I don't think United can do any better than Poch, and I'm a skeptic.