I'm not sure if this is what you're looking for when you said fixed frame screens but I use the "camp chef" portable projector screen. It allows you to move it easily and there is no hanging involved. Have a look at this
article at pricenfees I found it pretty useful. I'm no expert when it comes to projectors but they seem to know their stuff, it helped me make my decision.
I'm always interested when someone says an article is useful to see if it actually is useful, or at least accurate.
First: Size is based on viewing distance in relation to personal preference and THX design standards, not projector brightness. You buy a projector to fit the size of the screen which is appropriate to the space and your preferences.
GAIN: They actually do a decent job here, but end up going with "Contact someone" instead of actually giving an answer. In reality, 99% of installations deserve a 1.0 to 1.4 gain screen from a decent manufacturer. Some manufacturers have screen surfaces which increase shimmer and hot spotting due to the material they use. But, most do not and most do a fine job. Reading reviews can let people know what brands are acceptable. Negative reviews can often be some of the best reads.
ASPECT RATIO: That is very well discussed. I have a strong push for people to use 16:9 screens since they are (or should be) buying a 16:9 projector. There are few situations, and most of them are bad situations, in which a 2.35 screen makes sense. In no situation does a 4:3 screen really make sense anymore.
COMPOSITE MATERIAL: Okay, this may be called screen type. Light rejecting, acoustically transparent, standard. The information is decent here.
Not mentioned: Differences in roll up, fixed frame, electric, tab-tensioned, portable, etc. The biggest thing I find people not understanding is that a fixed frame screen for $300 is going to be better over the long term than any other screen. If you must use a roll-up screen, you should be using a tab-tensioned electric screen. Non-tab-tensioned screens are a waste of money, especially those which are motorized. Get a cheap manual roll up screen if you must have a screen that rolls up. Preferably get a fixed frame screen.
The reviews for the screens are very weak. A 72" screen isn't mid-sized - it's tiny. A typical home theater uses a screen between 100" and 120" Some go to 92" or smaller, but that is rare. Many go to 133", and some go a good deal larger with 150"+ in size becoming more common. A 150" screen is over four times the surface area of a 72" screen. Yes, a 72" screen is tiny in the front projection world. Heck, 70" is becoming more common for the flat panel world.
Want good and accurate information? Ask on forums of websites which specialize in A/V like here, AVS, Projector Central, etc. Don't just read some article assuming that they know what they are talking about. Also, before a purchase, look on Amazon and read the reviews. A $100 screen doesn't matter so much, but a $300 or $500, or $5,000 screen is certainly worth doing some homework on.
Especially when talking about expensive light rejecting screens like Black Diamond. The BD screen is one of the worst looking screens I've ever seen for actual image quality, but one of the best at doing what it is supposed to do. So, it is perfect in a lit boardroom, or at a bar with ambient light, but horrible for your home theater. That's something you can learn on forums, but not from most websites. Especially websites which include some advertising like the one you listed.
