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I find the view in binoviewers very flat and lifeless. The brain is used to seeing a slightly different image in each eye and in a binocular scope this is because the seeing conditions are slightly different at any one moment. This effect makes the view look more `real'. Also for planetary viewing the seeing may be better at any one instant than the other.
Once the brain picks up a detail if it can be reinforced by the other eye - even fleetingly it tends to lock the detail in much more solidly. In other words the seeing will look better with two eyes than one. With a binoviewer this extra image processing doesn't take place.
I find for deepsky observing you can never replace the lust re of wide exit pupil because each pupil only has half the light content. A true 5mm pupil in a binoscope is a wonder to see. The 40% contrast gain means that the background sky looks darker and more contrasty.
All that being said in practical terms binoviewers are easy to obtain and relatively cheap, and probably outnumber binoscopes by 10,000 : 1 in popularity. So there is a lot to be said for them. And with the right accessories you can use them on all your scope..
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