Which do you prefer and why for HDD or SDD hard disks ? And how is Ext4 with power failures nowadays ? iirc a few years ago there were issues with Ext3 (Yes, Ext3) and I remember a no barrier option was needed ? Is Ext4 much better ? And what FS do you prefer on usb storage ?
exfat for simple USB Storage, works on any OS (linux just needs exfat-utils and fuse)
Ext4 for linux drives
wasn’t exfat support included some time ago into the kernel?
Yes, it was added into Linux Kernel 5.4 in November 2019 after Microsoft open-sourced exFAT [quick context overview].