You can host your site on AWS as it is known for its top-notch reliability and uptime. Almost all of its data center locations have close to 100% uptime, and websites hosted there never go down. It is fast becoming a popular cloud hosting option for businesses owing to how giants such as Facebook host most of their business infrastructure on their cloud.
Squarespace's pre-designed themes usually emphasize imagery or video, so it might be great for people in visual media, entertainment, dining, or fashion industries. Many templates, such as the one below, are both simplistic and mobile optimized. While simplicity might be difficult for a software company or a business which offers many services, it could be great for consumer facing companies that sell products related to one major industry: