Most comparisons rank these two on how they behave when everything works. That is the easy half.
The question worth asking is what each one does to you on the day it breaks, and on that question the ranking partly reverses.
What btrfs genuinely gives you
Checksums on data, not just metadata. If a file is silently corrupted on disk, btrfs knows and tells you. ext4 hands you the damaged bytes without comment, because it never verified them.
Silent corruption is not a hypothetical. It is rare per byte and inevitable at scale, and the worst version is the one nobody notices for a year, quietly propagating into every backup.
Snapshots that cost almost nothing. A bad update, a wrong command, a botched migration: seconds to roll back rather than an evening restoring.
Both are real, both matter, and neither has an equivalent in ext4.
The fork is easy to see. The signpost is blank, and that is the accurate part: the choice is real and nothing about the trail tells you which way is right for you. It depends on which failure you expect to have.
What the comparisons leave out
ext4 is the format the entire recovery industry understands.
It has been the Linux default for well over a decade. Every recovery tool, every forensic suite and every technician knows its on-disk layout intimately. When an ext4 volume is damaged, the path from broken to files-in-hand is well travelled.
btrfs is copy-on-write with a considerably more complex structure, far fewer mature third-party tools, and a much smaller pool of people who have rescued one under pressure. Its own repair tooling is capable and it is documented as a last resort for good reason.
The filesystem that protects you better in normal use can be the harder one to save when it does break. That is not an argument against it. It is the trade being made, and it deserves to be made deliberately rather than discovered.
How to actually choose
Take btrfs if you want snapshots, you care about detecting silent corruption, you are running something you update often and might need to roll back, and you have a backup that leaves the machine.
Take ext4 if you want the boring option, your recovery plan involves handing a disk to someone else, or the system is one you will not be there to babysit.
And notice that the deciding factor is neither feature list. It is whether a real backup exists. With one, btrfs is a straightforward upgrade. Without one, its extra safety is doing a job that should never have been its job.
Nobody chooses a building for its fire escape. They do notice it once, at the only moment it counts, and by then the choice was made years earlier by somebody else.
The migration warning
A migration is the highest-risk moment in the life of a filesystem. Switching for its own sake trades a known quantity for an unknown one during exactly the operation most likely to lose data.
If snapshots or checksums solve a problem you have, the change is justified. If nothing is wrong, it is a risk purchased for nothing. And either way, the backup comes first and gets tested before anything is touched.
What we are not going to tell you
The state of btrfs parity profiles. Old warnings concerned specific RAID 5 and 6 configurations rather than btrfs as a whole, and that code has moved over the years. We cannot verify its current state from here, and anyone giving you a definitive answer on a page written months ago is guessing at your expense. Read the project's own documentation, for the profile you intend to use, on the version you intend to run.
Once the volume is damaged, the filesystem choice stops mattering and the order takes over: stop, image, work on the copy. That part is the same on both, and it is covered in our guide to recovering files on Linux ext4 and btrfs.
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