When given the choice between an excellent idea with mediocre execution and a mediocre idea with excellent execution, you should always optimize for execution. Don't "let the perfect be the enemy of the good" when it comes to ideating—put something together and see how it does. What's valuable about your ideas is not the idea itself, but the way you apply your idea and make your project real. Get out there and execute. That's what customers will pay you for and what investors will bet on, not your ideas.