Generally it doesn't matter which filesystem you use if you intend to put an encryption layer such as LUKS in between the hard drive and the filesystem, because LUKS will give every filesystem the same amount of protection.
However there are some things to be aware off, which will start to matter if you don't use disk encryption or if your LUKS partition is breached (maybe due to you having used a weak password).
There are some filesystems which use copy-on-write tactics to keep your data safe - meaning that if you change a file, the old data won't be overwritten. btrfs is an example of such a filesystem, and others don't do this for data, but do it for metadata. Pretty much every journaling filesystem has some amount of copy-on-write built-in.
The problem with copy-on-write from a confidentiality standpoint is that you can't reliably overwrite sensitive data. If I use the "shred" program on unix to overwrite a file ten thousand times with random data, it will just create ten thousand instances of random data on my drive and hide every instance except the last from view, but the original data will still sit around unmodified.
The same, to a lesser degree, is true with any filesystem on flash memory and SSD due to built-in wear-leveling technologies.
As you say, this can also be a plus if you're mainly interested in data integrity.