[Doc Faustus]

I don't think they're really comparable. It's like asking if Beethoven is as good as Jim Morrison. They're both amazing authors with totally different aesthetics and the products of very different times. Blackwood is a master of Gothic horror and a big influence on Lovecraft. If you're the sort of person who can enjoy Le Fanu and M.R James, then you'll love Blackwood. If you're not, then you won't.