My opinion on metal socket rails:
For toolbox use, I prefer cheap ****! I ordered cheap **** from J.C. Whitney in the 1980's and they worked fine, in a drawer of my 3-drawer Craftsman toolbox for many years. At some point later on, I thought I'd get some nicer ones and bought a set of Craftsmans. They wanted to turn every socket removal into a battle, and putting one back a modest tussle.
So I bought one at HF about ten years ago and yep, cheap **** is still easier, if you're not picking up the rail and carrying it around, but simply leaving it in a toolbox drawer and removing a socket at a time.
(Then GJ introduced me to Hansen/peg-style socket organizers and I stomped off to the horizon acquiring as many as I needed.)





















