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Due to risk of failure or risk of data corruption because the mirror can't tell which drive is right when there's a difference?
The second one.
Mirroring is good for speed, but a storage mechanism with parity checks will always be more recoverable. And you will have far more storage available.
I think data checksums allow ZFS to tell which disk has the correct data when there's a mismatch in a mirror, eliminating the need for 3-way mirror to deal with bit flips and such. A traditional mirror like mdraid would need 3 disks to do this.
ZFS or BTRF mirror will know which side is at fault due to checksums. I'm more concern about simultaneous falures of two disks. Rebuilding of a RAID puts lots of pressure on remaining disks, so probability that remaining one dies too is much higher. with RAID6 3 disks need to die to lost date, which is less likely but not impossible.