There are two approaches in my opinion. The first is the smarter of the two. Interface with your target market non-stop, figure out exactly what they would pay

There are two approaches in my opinion. The first is the smarter of the two. Interface with your target market non-stop, figure out exactly what they would pay for. If you can do this, try to get a commitment (and maybe even try to get them to pay) in advance, before you've even created the product. It's important to understand - you shouldn't say, "what would you pay for?" as they'll probably tell you 1000 things they think they need but don't. If you can come up with clear, easy to use solutions, to problems they would pay to solve (weather its saving money, time, etc.). Then often times, especially in the b2b space - you can get potential clients to pay in advance (maybe offer them some kind of deal for being an evangelist). Taking this approach is a good way to make sure your business will be generating revenue from day 1. The second approach is essentially the opposite. If your product is really going to be easy to build, and you don't think you have the time to spend interfacing with potential customers. Quit. Or just build it and spend many nights making changes until you find people who will pay for it. Bottom line is this, if you can't find people to pay for it in advance (or at least committing to beta program etc.) - prior to building the product, how likely are you to find people who will pay for it after it's live? Back to your original question, do some research as to which business has the largest opportunity for profit based on market size, competition, value proposition etc. And also which business would hypothetically be easier to create. Then go talk to both sets of targets markets, as stated above. That should help you make your decision.