Question: Which competitor to "Strange Stories" was edited by John W. Campbell?
Sentence (from "Analog Science Fiction and Fact"): The new editor was F. Orlin Tremaine, who soon made "Astounding" the leading magazine in the nascent pulp science fiction field, publishing well-regarded stories such as Jack Williamson's "Legion of Space" and John W. Campbell's "Twilight".
Relevant evidence: No