United's home form has provided a backbone to their campaign-they have won 41 points at Old Trafford compared to 30 points away from home-and they have conceded a Premier League-low seven goals on their own soil.
The result sparked celebrations among the Light Blue half of Manchester but Mourinho said City's title deserved to be recognised for its true value.
They have dominated this year's title race, scoring 93 goals and losing just twice so far.
Only two other players have captained more Premier League title winners - Chelsea's John Terry (five titles) and Manchester United's former captain Roy Keane (four).
However, Guardiola's side did win the Carabao Cup by beating Arsenal at Wembley. Manchester City have been a cut above the rest all season, and now they are confirmed as the best team in the Premier League. Brilliant performances from Paul Pogba and Alexis Sanchez proved to be vital for United's victory, and they consolidated their second spot in the league log.
"I have won titles".
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Unlike last season when the Europa League maintained United's interest in Europe, the club could only look on in envy in April as the big Champions League matches are played.
For a long time it has been a matter of when and not if City would win the league.
City had won nine consecutive league matches, a club record for a single season, to open up an eight-point lead at the top.
Few - including Guardiola - expected it to happen on Sunday.
The 47-year-old also took the German title three times with Bayern Munich, but he believes the unique strength in depth and physical demands of the Premier League makes this triumph among his very best. "I hope they don't go down and that they can learn from the mistakes that they made", he added.
Defences up and down the land have been routinely shredded by supremely gifted attacking talents like the Belgian Kevin de Bruyne, Sergio Aguero of Argentina, Spain's David Silva, Leroy Sane of Germany and - glory be - an Englishman, Raheem Sterling. I dont' think we deserve to lose but we gave them the opportunity to win the match by being solid in defensive and smelling a chance from set play.
The Citizens only needed one more win to secure the title following their win over Tottenham Hotspur, but the Red Devils' loss to West Brom means they have now mathematically secured the title.