Sure, there are other website builders out there, but Site by Nite really is uniquely different.
Essentially, what you have are web hosting companies offering hosting services. A website builder is one of the features they offer... it's merely a selling point. One that in many cases, they hope you'll never use anyway. Their whole purpose is just to provide hosting services... after that, you're pretty much on your own. Their main target customers are people who already know what to do with that hosting.
Site by Nite is completely different. Site by Nite is provided by a web development company to primarily help those who are new to the web, who don't have the knowledge and experience with building websites and web hosting. At Site by Nite, web hosting is just part of the package, but the focus is on you and helping you get a web presence.
And Site by Nite is more than just a service. It's about providing a community where you can share and learn from others just like you.