For me it was a tie between Gazetteer and Campaign Setting. Gazetteer has its old school value and I like the word, but Campaign Setting eventually won because it's clear, concise and exactly what it says.
"Setting Compendium" kind of implies that it's a collected work of various already published pdfs. And while you do say that it's compiles, I think this compilation is done from far smaller sources, and not from multiple full sized books. Hence, I feel Setting Compendium is a bit misleading.
"The Setting" on the other hand feels as if there are more books coming to World of Farland, and are things that are more or less necessary to run anything in Farland. Like "World of Farland: The Mechanics", "World of Farland: the Monsters", "World of Farland: The Quest for More Money" and "World of Farland: The Flamethrower".
Just my two cents or local fantasy equivalent.