Web Development
The third option, not considered by most of the people, is the connection speed of the network the host is using. Before you buy a hosting package, surf the websites hosted by the same host and check the network speed. You can also contact other customers and get an opinion about the service.
Another service a host must provide is online support. Must check whether the Support Engineers respond you quickly? A very good example you can consider is of GoDaddy. GoDaddy is a very good domain name registrar but not a good hosting provider because their online customer support is not up to the standard. If you call to their agents, they respond well and solve the problem but if you contact them via email, God knows whether they check customer emails of not.