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I still use ext2 on some things. Tended to use ext4 most often but now have begun using btrfs. I use zfs in bds always, or almost always.
The situation tends to cause the choice. As Woodsman points out, your use would help decide the filesystem. Again pointed out is that the distro's designers use a default. I'd assume that would create a better bug database to say default is more well tested.
I only have anecdotal experience. I use XFS on my server and haven't had any problems. Even after a partial hard drive failure I was able to recover my data. My server has only suffered a power out once or twice (it is on a UPS so usually there's no problem) but I didn't experience any data loss on the few occasions it did go down. For my desktop, I used to use reiserfs and had no problems. I switched to ext4 when I reformatted just because ext4 is more flexible (ie it has more tools for online resizing/recovery). The only data corruption I have experienced was with an ext4 partition after a power out. (My desktop is now on a UPS too...) I cannot guarantee that another filesystem would have done any better but certainly I am not 100% confident in ext4's ability to recover after a hard reboot (though I do have enough faith to continue to use it). I have heard that reiserfs is not doing so well these days (due to neglect) but not having used it for some time that may be misinformation. I continue to stick to XFS on servers and ext4 on desktops.
I run almost exclusively from flash media (usb flash and sdcards, no SSD's). I did a bit of testing a while back and found ext4 to have the best mix of speed, features and reliability/recoverability. At the time, I don't think btrfs had an fsck utility, but it was faster than ext4.
Nilfs2 and f2fs will be interesting to keep an eye on. I had a lot of fun playing with nilfs2, but until it's more stable and has dependable repair tools, it will remain a toy for me.
I used reiserfs in the past (for sentimental reasons, having met Hans Reiser briefly in Pereslavl-Zalesskiy, Russia), but now it's exclusively ext4, which seems to offer a good balance of performance and reliability.
Just recently the root partition on my server started to misbehave: it would remount read-only, and certain things (like print server) would stop working. I kept that thing going for a month by just fscking it a few times. And then the drive turned off forever. So ext4 got fixed on a failing drive some 4 times, and the server kept humming until the problem diagnosed itself.