I spent a lot of time dwelling on it, I was ready to buy a new 3D TV. Had decided to go with a 4k passive so that it was somewhat future ready too. What I really wanted was OLED and 4k, but they're just too expensive right now. Finally decided to go with a $700 projector that was 3D, the BenQ W1070 and finally finish up basement for theater room. I have to say, I'm loving it more than any other TV purchase so far. It's finally the closest I've been able to get to theater experience without buying tickets. Still have a little ways to go, lighting, flooring and some sound dampening but nearly there.
I'll probably upgrade to a 4k projector at some point, but I'm really not concerned about it now. I also have a passive LG from 2011 which works fine, but of course each eye only gets 960x540, that's really the main difference between active and passive. If you're going to sit close, I wouldn't go passive. Beyond that, I can't tell the difference. The picture looks great. However, my LG is above fireplace so you have to sit back farther and overall, it's just not great for 3D with it's location.
If it were me, I would just wait. There isn't much reason to upgrade to 4k yet. But if you do, active or passive you'll get 1080p per eye. But OLED is so nice...
I would take this over to the display section, you'd probably get more responses.
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