Using a non-standard aspect ratio is a great way to differentiate your video wall and capture attention. Traditional video wall configurations (i.e. 2x2, 3x3, etc.), are a logical extension of single displays, which is what people are accustomed to. But these layouts are becoming commonplace and as a result are starting to lose their impact. This has given rise to a new new trend: non-traditional video wall lay outs including artistic or mosaic-style video walls.
Instead of having an old fashioned 3x3 landscape video wall, consider a less traditional 1x9 in portrait mode. You’ll spend the same amount on displays, mounts and software, but will get a more eye-catching result. The trade-off is simple, using a standard aspect ratio makes your video wall look the same as everyone else's, but at least you have the benefit of reusing existing content. With a non-standard aspect ratio, your video wall will stand out, but you will need to put extra thought, time and effort into creating your content (as most content is made for standard formats, like the ones found on a 3x3 landscape video wall, not on a 1x9 portrait video wall).