Does your enterprise require faster-than-normal upload and download speeds? Or do your operations require only the usual web browsing and mail setup? Your answer plays a role in choosing the right Internet service for your needs. Plus, you need to consider how many users will be connected at one time, and what they will be doing while online e.g. do they need to constantly check emails, share files, or upload videos. Also, is your ISP throttling bandwidth at certain times of day or when using certain services?
These days, everything evolves so rapidly that you never know when a new Internet technology will surface. This is why it pays to work with a provider who understands the need to be future-oriented.
Take IPv6 for instance. It is the next generation protocol for IP addresses. If your business is willing to push the envelope when it comes to technology, it pays to have an ISP who shares your enthusiasm.
How quickly does the ISP respond to a reported outage or send their field service techs on site if a failure occurs? Check for field response policies and make sure that they meet your business needs as well as possible worst-case-scenarios. Often, it takes a day or two for a team to fix outages by being physically present in the area. Imagine how a day's worth of delay will impact your business.