I use World of Dungeons because it’s easy to teach and play. I like the simplicity, availability, and curve of 2d6. I like the mixed results gradient that’s still easy to remember. I like discussing the stakes before a decision is made. I like avoiding the dice with fictional positioning. I like that there’s only one resolution mechanic to remember.
I prefer skills/traits to provide advantage (best 2 of 3d6) rather than bumping up success results. The rest mechanic is a little weird. The XP system requires a little fiddling based on the context. The magic system isn’t for everybody.
I’d like to try using WoDu or a hack of it to actually play an extended campaign beyond just 1-3 sessions.