Tuchel is a (brilliant) manager of 22 world class, financially-doped, players, whose priority is the league and the Champion's League. Dean Smith is the head coach of a club that's policy is to recruit the best young players in the country and develop them into first-team players, or to sell them on at a profit. They're both doing excellent jobs.
Given that we lost 3-0 to them last week, playing Ings and Watkins, I'm not sure why there's such certainty that they'd have got us over the line.