I have to say that I was kind of surprised to see this question as it telegraphs such a naive approach to business.
Here's a hint for you. Before you build anything, you should do a competitive analysis of your target market. This should include all direct competitors as well as alternatives and substitutes. You should also map out how the competition messages to your market and then analyze why you are different/better.
I've done these kind of workshops several times for startup SaaS companies and I'm amazed by how many don't even understand their competition. This is like trying to make bread without ever bothering to learn how to knead dough. It's fundamental to any successful strategy.
Once this analysis is done, then one can create what I call "Power Positioning" which is messaging that is designed to put your competition on defense.
My advice? If you are asking this question, you have no business starting a company or launching a new product. Instead, get a job with a well run company and get some experience.
Sorry if this seems rough, but competing and winning is rough. The sooner you figure that out, the better of you will be.