The ex-Feyenoord manager is relishing his time at Anfield after taking over from Jurgen Klopp.
While Koeman is happy to see another Dutch coach impress, he believes slot has a lot of weapons at his disposal.
Koeman said on comparisons between Slot and United coach Erik ten Hag: “I watched because of the many Dutch players.
“But of course I also looked at it from a manager's point of view.
“Arne Slot is doing a slightly better job. But if you have the front three that he has, you must realize you are lucky.”