As an old-school player I would love Greyhawk. I voted for Planescape though Spelljammer would be very close for me. Birthright is my favorite D&D setting, and while it has its own tone I don't think it would work. As for the others: I'm almost 60 and don't need Strixhaven (though I do have the book), never been a huge Dark Sun fan though I do think it's up Larian's alley, Ravenloft has always seemed too closed in for me and I'm not a huge fan of gothic horror, as for Eberron it may be a generational thing but the Final Fantasy vibe just isn't something that gives me warm fuzzies when it comes to D&D. I do have the setting and have run it, but it's not what I would really look for as a top choice.
As for Dragonlance, I've never been a fan so that would be a hard sell for me. It has some good ideas, but it's too tied into an existing story for me.
