Nightfall said:
No one did but that's what I come across every day when people post "What's the best "OFFICAL" adventure?" or "What's the best rule suppliment for Paladins, etc" kind of thing. Seems like unless it's WotC branded to its behind, it's not worth your time.
Yes, this attitude can be very frustrating. In my opinion, the official sources hold neither the title for "best adventure" nor the one for "best setting". Which doesn't mean that they are bad, either.
As to the decision between the
Forgotten Realms and
Eberron, it's lastly a matter of taste. Do you like airships, trains and skyscrapers in your fantasy, want to see standard races from slightly new angles, have a relatively open world and low-level NPCs, then
Eberron might be the way to go. If you are more into "standard" fantasy, like a plethora of high-level movers and shakers, a world of sheer endless adventure potential with countless supplements, then the
Forgotten Realms might be the right thing. Personally, I prefer them over
Eberron. You don't have to buy them sight unseen, because there is lots of material available for free under
"Classic Realms Products" on
this WotC page. With that material alone, you can play for several years

.
This said, quite a few 3rd party settings are definitely worth looking into, like
The Wilderlands of High Fantasy, Midnight, Dawnforge, Iron Kingdoms, Kingdoms of Kalamar, Oathbound or the early
Scarred Lands. Not all of them can compete with WotC's production values, but that's not always decisive for how well they can evoke excitement with players and DM alike

.