Recently ran into a very interesting video captured during the LinuxConf in Australia. This video captures the debate between John Mark Walker representing GlusterFS and Sage Weil representing Ceph. Both also represent private entetires Gluster -> Gluster Inc. that now owned by RedHat and Ceph -> Inktank.
Enjoy the debate, and post any thoughts, comments you feel sharing.
Another bonus is the intro for those who not familiar and would like to learn more (thank you Satoshi for the suggestion):