Come on now, last time, when he chose to go to Bayern Munich, your complaint was that he didn't go to England because he is afraid of competition. It was Chelsea he rejected that time. This time, you are saying the opposite, that going to Chelsea is the easier job. Make up your mind.
By the way, in case you missed it, Chelsea are in deep crisis. IMO, Chelsea job is the more challenging one than the ManU job, so you are entirely wrong there, too. Not only he would get more money to spend at ManU, but there is also already a strong basis for Guardiola type football there with Schweinsteiger, Herrera, Carrick and Schneiderlin in midfield.
I don't recall saying that, but if I did, fair enough. Staying in Bayern is obviously a significantly easier job than Chelsea, but if he comes to England, City and Chelsea are clearly the two easiest jobs. The Man U job is a big one, regardless of how much they're threatening to spend.
Both Chelsea and Man City require minor surgery. If there are any troublesome characters in the dressing room, he'll bin them, and just throw money around to find a replacement(s).
Given how he turned Bayern into a borefest, compared to what Heynckes had them playing, I reckon he'd actually hinder Arsenal too.
If he goes to City or Chelsea he'll improve their quality, just by being there, because they've both been wretched this season.