They are both cool for short term use, but I've yet to see a shutter glass/etc implementation that is synced well enough to the screen and blocks 100% of the light to avoid ghosting.

VR googles have their own issues, because the lenses never seem to be perfectly in focus, and the resolution isn't high enough directly into the glasses.

In both cases you can choose to ignore the problems for a while, but at least in my case the eye strain builds up enough I doubt I could deal with it for even 4 hours a day on a regular basis.