Ruby on Rails最佳Linux发行版？

After a bad experience trying to get even the simplest Rails application running at Lunarpages, I'm moving to Slicehost. Does anyone have an opinion as to which of their Linux distros to use for a fairly high-traffic Rails site? They offer CentOS, Debian 5, Fedora (10 to 12), Gentoo, Red Hat EL 5, and Ubuntu (8 and 9).After a bad experience trying to get even the s