XFS is the recommended filesystem to use for most cases.  It supports larger files, where ext4 has a 16 TB limit.  Its journaling is faster.  It's optimized for parallel I/O.  It's more resilient.  Both XFS and ext4 are rock solid.

There are certain use cases where ext4 may be slightly better.  The journal file is an example of this.  It also is a bit more flexible in certain areas.

We have not been impressed with OpenZFS performance in IRIS, and don't recommend that path.

LVM technology works great, either with XFS or ext4.  A large number of our customers use this approach.  It multiplies IOPS and bandwidth linearly.  You do have to use LVM backup on those volumes.