I've never really seen Man Utd as cheats. They've been the best side in the country, playing with flair and had some amazing players in the past 15 years.
Whereas Chelsea's game is based around diving, spoiling tactics, surrounding the referee and some rank football thrown in.
Plus, Man Utd are a football club with money generated by being a fantastic side....whereas Chelsea are a russians play thing who'd be in the Championship without him.