Btrfs appears to have an emphasis in security and data-integrity. It its safer when gradual changes in your system are performed. Instead, ext4 appears to lean more to reliability and speed. Backups and deduplication are harder in ext4 Also, btrfs has the ability to create links for duplicate files automatically, liberating disk space.

"we had to build a complete and compliant operating system in order to perform resource control reliably"

epic real-talk. the only people on the planet who seemed to have tamed linux for workloads. controlling memory. taming io. being on the bleeding edge, it turns out, is almost entirely about forward-progress. what can we reclaim?

• oomd for memory protection
• fbtax2
• psi monitoring for io regulation
• cgroups v2

https://facebookmicrosites.github.io/cgroup2/docs/fbtax-results.html

Now using btrfs on my notebook. Works fine!

One of the reasons for using it (from btrfs.wiki.kernel.org):

"SSD (Flash storage) awareness (TRIM/Discard for reporting free blocks for reuse) and optimizations (e.g. avoiding unnecessary seek optimizations, sending writes in clusters, even if they are from unrelated files. This results in larger write operations and faster write throughput)"

Since btrfs once ate my data (pre 1.0) I did several crash simulations to boost my confidence beforehand.