The twin had two more ponies than the four and weighed less. That set of organ pipes in back were heavy, even after rusting out.
My first bike was a 73 model like the one in the op, but it was stock. Threw on a set of Jardine slip-ons and you could feel the difference, mostly due to weight reduction.
A friend had a CB360 (no, they weren't 360cc, it was a 350 with a six gear tranny) and the four was the better riding bike. Very smooth when set up properly. Mine took the girlfriend (later wife and now ex) all over. 60 mph was 6k rpm but it didn't seem to mind as it liked to rev.
I parked it for several years and then pulled it out and tidied it up a bit. It felt tiny and gutless then as my ride then was a 75 GL.
I sold the four to a kid for his first bike.