Is there a difference of stability between Linux distros?

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http://unix.stackexchange.com – I've using Debian since 2010 for some home purposes and it has been stable. Is Debian still a good option if I need a server for heavy network, cpu, disk and memory usage? Last month I listened to some admins say that RedHat is the most stable in bulk operations and that CentOS is a free version of RHEL. Their opinion is that CentOS is the best free distro. CentOS is getting very popular in my country (Dominican Republic) and I've wondered if Debian is getting behind. Can RedHat, Debian, CentOS or Suse be used for bulk operations servers? (HowTos)