I will simplify web host even further.
Martin's Rules of Ecommerce Web Hosting
* Buy more web hosting than you need.
* Host with the people that create your website (if at all possible).
* Video or big graphics need a Content Delivery Network (CDN).
* Be aware that CDNs can wreck SEO.
* No host is perfect and up all the time, what matters is how fast they come back and that down time is learned from and avoided.