Is it better a reality of a dream or a dream of a reality?

"A Japanese research team (who else?) has successfully processed and displayed images directly from the human brain, they said in a study to be published in the US magazine Neuron.
While the researchers at the ATR Computational Neuroscience Laboratories have only reproduced simple images from the brain, they said the technology could eventually be used to display dreams."

It works this way:

When you look at something, the retina converts the image into electrical signals directed to the brain cortex.
The trick is catching the signals and recontructing the image.

Providing this IS REALLY possible, I do not like it.
Dreams are what they are because they are dreams.
The moment they are on a screen they become reality.
Is it better a reality of a dream or a dream of a reality?