Not sure about Pep as the top one. He's won a lot, but always with the top sides with the most money available. Would love to see him at a midtable club.
Howe, Iraola, Emery and Glasner have all been more impressive than Pep over the last few years. Imo.
Arteta would probably be bottom half on my list. Spent an enormous amount of money. 1 trophy during his reign and that was 5 years ago. Their football is abysmal as well.