Regarding business hosting, Cloudways is also able to handle business class web servers and even announced today staging capabilities that business, publishing, agencies and more app critical firms require for performance and testing. Support chat is also a big plus for wpengine who also has staging and good backup capabilities. Support response time is critical for business sites and the pricing is typically 3x per instance higher plus companies should always retain a specialists even with managed hosting partners.
Many web hosting services offer so-called unlimited or unmetered service for whatever amount of bandwidth, disk storage and sites you use. It's important to understand that most terms of service actually do limit the definition of "unlimited" to what's considered reasonable use. The bottom line is simple: if you're building a pretty basic website, unlimited means you don't need to worry. But if you're trying to do something excessive (or illegal, immoral or fattening), the fine print in the terms of service will trigger, and you'll either be asked to spend more or go elsewhere.