For me it’s broken shore. Pre-flying it was a nightmare to navigate, the artwork was very uninspiring imo, the story for that patch was kind of bland as well, and it’s probably the least fun i’ve ever had during my time playing wow personally.
Nazjatar shares some of the issues such as layout, annoying mob density, etc. But the aesthetic is more better, imo, and i enjoyed the story more. It was fun working with the Unshackled. There were enough unique things thrown in there that i was still able to enjoy my time overall despite my complaints.