Even though I have a 65" OLED, I prefer my active Benq 1070 and 125" screen which use 144hz glasses so I don't notice any flickering. 10' seating, it's just perfect. The OLED has a really nice picture though, some low light movies that don't work as well on the projector are pretty good on the OLED. Large size and in your face 3D or best image quality possible, hard to decide sometimes and sometimes I watch on projector and rewatch on OLED too. I have a motorized acoustic transparent screen in front of 65" OLED so depends on my mood.
As far as glasses, I think passive are definitely better. Lighter, not as dark. Also, the nose pieces come off my active glasses and get lost, plus having to charge and I bought some Apeman glasses that have the left/right images switched by default, very annoying. I have 6 pairs of Estars which are awesome but they don't make those any more. And they don't appear to make kids active glasses that I've seen. But they do make kids passive glasses. I've only looked for DLP links glasses though.
I like both active/passive, but both have drawbacks too. Hey, as long as you get a system that works best for you and you enjoy it and it looks good to you, that's what's important.
But if I had to just choice one and I'm going by the best 3D experience possible, I would go with a projector. It doesn't even have to be an expensive one either. I think I paid under 700 for mine when it was new. That's really all you need. Save some money and have fun. But of course you need the right room for it. I have mine set up in basement with walls painted black and ceiling tiles a dark gray. I wouldn't put one in a living room that has to be set up every use, I did that for awhile but eventually the projector stayed on the shelf, just too much work setting up.
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