The best replacement for xfs is ext3.

The best alternatives to xfs are rated as following:
★★★★★  ext3
★★★★  ext4
★★★  jfs
★★★  zfs
★★  btrfs
★  reiserfs
★  ext3 openfiler
★  ext4 mysql
★  reiser
  ext3 thecus
  ext2
  ext4 ssd
  ext
  ext3 performance
  ext4 postgresql
  reiser4

Your alternative for xfs is not listed? Suggest!
Speaking about xfs, one probably shouldn't forget about rhel5.

Other search terms related to xfs and their ratings are:
★★★★★ rhel5
★★ snapshotting
You have in mind a companion for xfs and it is not yet here? Propose!



Google Trends

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xfs
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