Metal horizontal

I think the upkeep/cleaning of an exterior glass rail would be burdensome. Black metal if that's the color of your light fixture and poles on the side (hard to tell if black, bronze or brown).

I'd use a metal railing painted the same deep brown that you have on your door and awning posts. I'd extend that second concrete step so it's the same width as the porch area.

It's a charming house and has lots of potential.