The dual POV really needs to be reserved for stories that can’t be told from one view or the other. Beginnings was one of those—as was Personal Demon. If it can be told from one POV, then I think it’s better to stick to that. Which is to say that while I wouldn’t avoid another Clay + Elena joint narration, I’m happier doing one or the other per story.
As for having more than one idea for a story, I do brainstorm possible ideas, but it’s usually obvious which one “wins”—it’s the one with the most potential for conflict, emotion, etc.