I'm not convinced Klopp is any better than Wenger.
The squad he has had is probably the best group of players Dortmund have ever had. For all the stick people are giving Wenger (for all manner of things), if he had only bought the signings he made in January, namely, Gabriel, last summer the conversation might be totally different by now.
This summer there is no glaring gap in the squad necessarily so it is an interesting time at the club for that alone.