Today shows the release of OpenBSD 5.6. Download OpenBSD 5.6
There’s quite a few changes but most notable is the inclusion of LibreSSL and sendmail is no longer default, it’s SMTPD. Head over to the website for a full list of changes etc.
Personally I prefer CentOS over OpenBSD, but it’s all down to personal preference as all in all, all Unix type systems are pretty much the same.