I’m running ext2/ext3/ext4 since 2002(?)… Never had a problem! But I’ve lost lots of data using reiser4, xfs & xfs, specially when blackout happens. If you don’t have a no-break/not using a notebook, and you have important data for yourself, I’d stick with ext4. I actually didn’t notice thaaaat much of performance boost, when using fast HDDs, SSDs & Nvme between any of these formats!
Stick with ext3/ext4
That’s why you should set a (12h-24h tops) lease time on your DHCP…
You know you can just write: stable or testing on your /etc/apt/sources.list repository config, instead of the distro codename, don’t you?