Games are a super competitive field. I wouldn't expect commercial success unless you can clearly identify an undeserved market niche that you can fill. Though

Games are a super competitive field. I wouldn't expect commercial success unless you can clearly identify an undeserved market niche that you can fill. Though of course market demand is also key in creating a successful ebook or SaaS product. Of the ideas that you have for ebooks, SaaS products, and games, which has the biggest unmet market demand?