It hurts it really hurts
One manager has inherited the best team in the world, the fact that another manager can't lead a set of players clearly not as good as the opposition to victory therefore means he's not as good? Seriously do you really need everything spelling out for you?
Lets look at it another way Real Madrid Barca's only challengers in their two league team couldn't get the better of Barcelona in the 4 biggest meetings between the two last season does that mean Mourinho's not as good as Guardiola either then?
Guardiola inherited a team that had the foundations laid by Rijkaard previously, it was during Rijkaard's tenure that Barca won their first Champions League & their first La Liga for 5 years and what has Rijkaard done since leaving Barcelona?
Guardiola inherited a team that had the worlds best player, two of the worlds best midfielders and not to mention at that moment in time one of the worlds best strikers (Eto'o) to even suggest that Guardiola has achieved more in his tenure than Fergie has in the last 10 years is beyond stupid.
Has Guardiola built 4 or 5 different teams whilst keeping Barcelona at the top?
Has Guardiola seen off multiple different challenges from a varying different styles of opponents in his two team league?
I find it humorous that you chose to list Barca's trophy haul during Guardiola's reign as well, have you taken a look at Fergie's during that time?
2 Premier Leagues
2 Carling Cups
3 Charity Shields
1 Fifa World Club Cup
So he has 4 less trophies and given two of those that he didn't win was against Guardiola's inherited better side and 2 we couldn't compete in because they're only eligible for teams that have won the Champions League you're right Guardiola's haul in these 3 years is by far vastly better isn't it
There is no one best manager in the world and even if there is why should that be a negative for every other team in the world that doesn't have him in charge of their side? Where's this written rule that at all times Man Utd must have unequivocally the best manager in the world, the best players in every position in the world, win every game they play, win every competition they're involved in?
Fergie could win nothing this season, Guardiola could win everything and that still wouldn't make him the better manager