Join Date: Jan 2007
Location: Home of the Hawkeyes
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In order to ensure a full 90 degree swing, you will need to be certain that the extended arm length (not just total depth) is longer than half the width of your TV.
Other than that I think you will find the biggest difference between a lot of these mounts is fit and finish. Some are base square stock steel or aluminum with a sprayed on pebble finish or fairly decent powder coat, others are more smoothly contoured, cast pieces, with nylon bushings between joints, and more predictable position retention. You get what you pay for, mostly, kind of depends how important aesthetics of your install will be. The mounting arm will be visible when you have the TV swung around, no arguing that.
As far as single arm VS double arm, kind of depends on the design. A single arm is easier to position, a double arm will take more finagling to fold flat again. I would strongly recommend looking at mounts that have a 46" display at the smaller end of the range of fit, instead of the max. Plus find out your VESA mounting hole pattern if you can. Much more reliable than screen size for mount selection.