X is a protocol for graphical interface elements, such as application windows. With remote X, the application's window IS on your local screen, using the remote cpu and fileystem. It's part of your local desktop, a real, local window.
VNC is a highly compressed PICTURE of a remote desktop.
Since X is the real thing, and VNC is a low quality PICTURE of what X is actually doing, it's just like you're saying that a porno mag is better than an actual girlfriend. Your comment is THAT ridiculous.
Besides the fact that you seemingly don't know the difference between an application and a desktop environment.
If you ever want to stop masturbating with VNC and try the real thing, use vnc -Y -C . Y is a better version of -X, and -C enables lossless compression, which is very useful on most networks.