Check this out…
Display attached to the Pi with switches for service people
Regarding setup, I think they both have pluses and minuses. I believe that there have been more power related issues with the Pi. In this sense, the turnkey version may be better. As I was getting the OSPi set up, it took a lot of time to adapt to the Linux, get SSH set up, etc. A lot of stuff, at least if you aren’t really on top of things. The standalone version is basically plug-and-play. There were more than a few times where I thought about trying to trade out my OSPi for the standalone.
All that said: the OSPi is just plain fun, with lots of options and very rewarding.