RedHat if you want an OS you can get formal support on, CentOS if not (as that's what Atlassian tend to use). It will work find on most Debian based distributions too - obviously Ubuntu is at the top of the popularity list there. It works fine on plenty of other distros, and even the non-Linux FreeBSD.
The answer you need though is not a flat "CentOS" - I would pick the style of distribution you are most familiar with and go for the biggest most widely supported one of those. (I'm most familiar with Debian, so I'd choose Ubuntu. If I was ahead on the RedHat family, CentOS for test and RHEL for Production, and so-on)
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