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Nobody should compare Leverkusen and Manchester United currently cause Leverkusen is in a league where there's not much competition and any good coach would succeed there if they can beat or draw Munich home and away then do well against other teams. It's not similar I'm the EPL where there's Manchester City, Arsenal, Liverpool, Chelsea, Tottenham, Newcastle and even other tough midtable teams to deal with. The Premier league is not for the weak.
If you think the Bundesliga is easier than the Premier League, let's see what Leverkusen, currently under the auspices of ETH, will achieve. If the Bundesliga is indeed easier, ETH should be able to deliver at least one domestic trophy, whether it's the Bundesliga title or the DFB-Pokal.
Furthermore, this season, Bayer Leverkusen will also be returning to the Champions League, Europe's most prestigious league. Last season, under Alonso, Leverkusen only managed to reach the round of 16. If the domestic league is indeed easy, then perhaps the real challenge lies here, in the Champions League. So, can ETH lead Leverkusen to a better performance in the Champions League?