Yes, I do believe it would be harder for him at United. The scrutiny he'd be under would be much more intense. He'd also have to deal with ex players and fans etc reminding him of the 'United' way. It would piss off a tetchy guy like Pep. Then continuing with LVG's possession football would be another hurdle especially if it's not going well...
He strikes me as someone who just wants to concentrate on his football 'vision' and doesn't want to deal with politics (plenty at United it would seem) and the other things that come with management. He especially hates the press, and everything United does makes the news - that would drive him nuts.
Putting all the banter aside, he'll be fine. This will pass. Whether or not he wins anything or makes (or not) top four won't matter. He'll be backed by the owners and he'll get it right somehow.
In the meantime though, it's nice to have a little fun at his expense