I don't know anything about any differences in equipment, but I do know that appearance-wise, the 2018 RT Limited Dark looks exactly like a 2017 RT-S. If you plan on customizing, you can paint over the black but I doubt you can paint over chrome. I also know that sometimes chrome peels off, at least it does on auto wheels. That and the cost was enough to talk me out of the 2017 Limited (chrome) version. I painted my RT-S wheels red metallic which makes them a little bit unique. OTOH, if you love the chrome and you want everything to be chrome, only the Chrome version will do and that would make it a good bargain even if it costs more. Probably people with peeling chrome are people who don't take care of their property so I wouldn't let that deter me.