Without getting into a distro debate, the immediate justification for RHEL to Enterprises is that there's somebody to blame if it doesn't work, and that there's

Without getting into a distro debate, the immediate justification for RHEL to Enterprises is that there's somebody to blame if it doesn't work, and that there's a vendor to call if their generally mediocre onsite staff can't solve a problem. Compared to Solaris, it's cheaper, package management is much easier, and it has all the Linuxy goodness that corporations feel make them more agile.