She's (a) new, so nothing much is known of her compared to say, Pelor; (b) has the best non-FR Channel Divinity feat; (c) has an evocative name.Wow lots of love for the Raven Queen! I like her too, but I wonder what it is about her that captures the imagination gamers.
Me, I'd make her the god originally worshipped by the ancestors of Strahd Von Zarovich, making her the reason for Ravenia Von Zarovich's name and Castle Ravenloft's name. Which would make her the one that Strahd made a deal with.
Torog. We know absolutely nothing about him, or his worshippers. While for fairness's sake a good or unaligned god should probably come first, the one I most want to see described is Torog.