xfs dynamically allocates inode storage space. A very typical failure scenario of ext4 is to run out of inode quota while there are plenty of free blocks available. This scenario is not possible with xfs. This alone makes it more dependable than ext4 in practice.

There used to be major performance variances where xfs was better in certain workloads and ext4 in others, but those appear to have been smoothed out and now their performance seems very similar across all workloads.