I've tested many portable Linux distros, but PorteuX is the one I keep on my USB drive

I don't see why this use-case needs a special distribution?

I have Arch installed alongside Ventoy on a thumb drive with all firmware packages on luks encrypted partitions. I keep it in sync with my other computers in terms of dotfiles, configs, packages so I can boot my usual environment on any PC.

As long as all references to partitions are UUIDs (fstab) or by-uuid block device paths it just works and I don't see why you couldn't do that with any other Linux distribution.

I'm not sure how to pronounce that name so I'm going to opt for an all-in French pronunciation. That makes the capital X silent!

I personally love MX for that