They won't stop standing waves in the room, won't bring up any nulls in the recording, don't offer any isolation, etc, etc. Sure, you'll knock some reflections down, but so will a blanket. Reflection filters themselves also don't offer much better results than the plain room.
In bigger iso booths, you'll see the use of diffusion as well to keep the space alive but controlled. Behind the wood, behind the fabric, you'll find fiberglass or mineral wool insulation. Instead, you'll likely see mixtures of fabrics and wood - but this isn't the treatment either. Also, foams aren't good for treatment in a booth anyways - hardly any professional rooms use foam. I will tell you however that there are MANY reasons to use an iso booth in a studio when you're recording, regardless if you're recording more than one person or not.
Sorry, but there's no testing data comparing either, and there is not even a recording to judge whether I need one or not, so as far as I'm concerned, there's no real reason to want to do either from the video.
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