Orange if having a built-in tuner is of interest. Ampeg if the tiltback feature is of interest. Otherwise it's a matter of what color you like better.
I've owned the Orange but didn't like the built in compression. I have the Ampeg and like it, way better.
I’ve only tried the Orange 50; I found the controls a little difficult to navigate, but was able to land on some decent tones. I had a 1st generation Ampeg BA 108, over 10 years of faithful service. Haven’t owned a 2nd generation, but all I have tried are nice amps. I currently own a Rumble 25, I love that little thing. Worth a look too.