I find the sound of bi-wiring is usually better than using a single wire of the same type. The only speaker in my experience for which this wasn't true was the Sonus Faber Concerto Home.
Much of the benefit may be eliminating that base metal jumper so many manufacturers use. With my Sonus Faber Electa Amator I's I had two runs of OCOS connected to the top binding posts and a high quality jumper between the top and bottom. It was easy to disconnect one of the wires anytime anyone asked the question, and the difference was obvious and convincing.
Much of the benefit may be eliminating that base metal jumper so many manufacturers use. With my Sonus Faber Electa Amator I's I had two runs of OCOS connected to the top binding posts and a high quality jumper between the top and bottom. It was easy to disconnect one of the wires anytime anyone asked the question, and the difference was obvious and convincing.