D&D General Kitchen sink setting or narrow genre focus for long-running campaigns (2,5,10+ years)

[Zardnaar]

I don't think it matters it depends on the group.
My campaigns tend to go for 12-15 months. We switch things up.

 

[Mort]

I tend to run in Greyhawk, a kitchen sink setting. But campaigns tend to get pretty narrow, focusing on something specific like the Scarlett Brotherhood (intrigue heavy and very political for that one) or the war against the demigod Iuz. I've found the players like narrowing the focus of the campaign themselves, rather than me pushing it on them from the get go.