In the past 5 years or so, Chelsea have spent more money. But, in the past, United were also big spenders. Overall though, I would say Chelsea have spent more money.
Both are heavily in debt.
Personal opinion really. But on last seasons performance probably Manchester United. They won the 2008 World Club Cup, Carling Cup and Premiership, as well as getting to the Champions League final. Chelsea won the FA Cup, but we shall see this season. Manu are better!
The United States is the country that spends the most money overall. In terms of military spending, the United States also leads the world.
Money
United States
Arsenal, he made a large money contrubution towards the clubnew york giants
sponsors etc.
10 million
In England the top four clubs are the richest. They are Manchester United, Arsenal, Chelsea and Liverpool. actually their owners are rich, Chelsea are a good example as they are over 700 million in debt, only their owner is rich, the same goes for Liverpool, all teams expect to win trophies to pay the debt they get like arsenal who are still trying to pay back on the emerites which is why they have no money to buy players and has to look for talented youngsters abroad
The United States spends the most money on research and development compared to any other country in the world.
Manchester United
Leeds United sold Eric Cantona to Manchester United as they were need of money and Manchester paid them well.