The main reason I've steered clear of OpenSUSE is its commercial backing as opposed to being a true non-profit community distro like Debian or Arch.

Red Hat have influenced Fedora decisions before and obviously blew up CentOS as a RHEL clone when they had the chance. Canonical constantly make bad decisions with Ubuntu.

I will add that I've heard nothing but good things about SUSE and OpenSUSE. SLES sounds like a decent alternative to RHEL and the OpenSUSE community distros sound pretty solid.