As the MIT / New Jersey schism taught us decades ago, there is no one concept of "simple". Simple in design? In implementation? For the user? For the architect? To set up? To troubleshoot?
Which is simpler: a pile of files on a hard disk, or a playlist in an online music service? It depends.
It's like asking what's the simplest mode of transportation: a 1985 Toyota, a 2018 Toyota, a Lyft, a bus, or a bicycle. You could make a good case for any of these, depending on your situation. I know people who can't operate a manual transmission, so the 1985 Toyota would be problematic for them, but on the other hand, I've never fixed a 2018 Toyota (or a bus) with just the tools in my backpack and a water bottle.