On your list I chose Forgotten Realms, Dragonlance and Eberron because they have the most lore and/or are closest to the tastes of TV audiences.
That said, Ravenloft would be by far the best (one can make an argument for Dragonlance for sure) as
1. Horror- always popular no matter the rest of the TV's shifts
2. Strahd- go with above, Vampires are ALWAYS popular and people can easily see it as the Dracula rift it's intended to be
3. Flexibility- the ambiguity of the settings Dark Powers and the ability to move between different realms through the mist open up the story to basically be "Monster of the week" horror in the veins of Twilight Zone/Black Mirror episodic series or for long form storytelling.
4. Deep and wide lore- There are enough established characters like Strahd, Van Richten, Church of Ezra, Azalin Rex, Hazlik and others not only play on known and recognizable horror tropes, but have enough of their own identities to stand out as "new and different" to make it easily digestible by a wider audience.