There are several reasons that are important in deciding to employ Ubuntu server. First, Ubuntu is very popular and gaining momentum. On distrowatch.com Ubuntu is listed as the most accessed distribution. The popularity of Ubuntu suggests that there will be business and job opportunities for those who are trained in configuration of the Ubuntu Server. Popularity of Ubuntu also demonstrates that the distribution will be around for awhile so your training will remain a valuable commodity.
A second reason for using Ubuntu is the philosophy of the distribution. Ubuntu is committed to using up to date drivers and cutting edge technology. Of course, if you are familiar with Red Hat Enterprise philosophy of testing all programs over a long period of time, this might be a reason not to choose Ubuntu server. At any rate, Ubuntu will make every effort to remain cutting edge.
Third, Ubuntu is innovative. One example of the innovation of the company is the approach of Ubuntu to develop a simple, but useful Desktop. A one CD distribution that can effectively grow with the needs of the user. Innovation can be seen in the movement of Ubuntu to Upstart which reduces system requirements as it allows for services to only be started when needed.
Fourth, I have noticed that Ubuntu learns from others in Open Source. Ubuntu has moved to LVM2, acls, and better software RAID support. It takes time to develop a server that is robust and can provide the “under the hood” stuff that administrators need for effective deployment. As Ubuntu watches development with other distributions, like Red Hat, they are beginning to support the kinds of things that the Linux leader in server deployment has learned over time.
If you are searching for a Linux server that is popular, committed to a simple but cutting edge distribution and a company dedicated to innovation, Ubuntu is a great choice.