XFS vs Ext4 vs Others - which file system is stable, reliable, for long run such as 24/7 case

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http://unix.stackexchange.com – XFS and Ext4 file system which one is really stable and reliable for long run with heavy disk write and read? the system will be used in a place where 24/7 is in service, and every second there is read and write in the disk system need to be 99.95 % uptime for about 1 year run system need to be maximum downtime in year for about 20 hours maximum Which file-system is the best choice for such challenge? ( i wanted to use Solaris or FreeBSD but for my project i must have to use Ubuntu or ArchLinux or Fedora or CentOS). But confused with which file system to choose. (HowTos)