3 trophies (including first UEFA) in just over 2 seasons and less than 1.5% off SAF's win rate - if that's "fairly bad" then I don't think you're going to enjoy the next few seasons.
I think most managers would lose the plot at United. The expectations are unrealistic, and the current ownership model is a contradiction to them.
I think the main difference will be in his own expectations - he would have expected unconditional transfer support at United, but he wouldn't do at Spurs, so it's a completely difference scenario - as well as living with his family in this job.