I'm still trying them out, but if they work as advertised, then AppImages. That's mostly because I use my desktop and laptop pretty much equally, so being able to copy and AppImage from one to the other and keep going would be really handy.
On a similar note, if a computer dies, being able to just copy and paste them to a new computer, or run them from a portable drive would be great.
The Spinward Fringe series by Randolph Lalonde is very good. The first book is free too, so that's a plus 👍