Why? I would take a VZ58 over an AK any day and would most likely take a Type 81 over an AK.
They really aren't anything special. They just have appeal because you can't own one.
That's because nearly all U.S. market AKs are poorly made, I'd take a good quality AK over a VZ58 any day.
The Type 81 looks very interesting however, I'm just a bit concerned about that rear iron sight setup, it seems a bit shrouded as compared to the AK and VZ58.