He has taken Everton to the same level we are, in about a season, with no world class players.
Wenger has had the luxury of being the longest serving manager in Europe, at the same club, in the same league, with more money and under almost no pressure.
If it was a choice of Wenger or Koeman I would have the manager that is on the way up rather than a manager that's stagnated.
Koeman did a good job at Southampton and is doing a better job at Everton.
He is experienced in the PL, and because he was a world class player, he has the respect of the players.
If Allegri doesn't want to come here I think he would be the best choice.
The main question is, would Koeman leave Everton to come to a club who's main ambition is to make a profit?