Digital signage is good but from my understanding (and I could be wrong) probably over-engineered for home usage. They're intended to be powered on 24x7, and last a long time. Probably more resistant to burn-in too. All of which is good, but if your use case isn't so intensive you could get by with something lower-end. (Especially if you want to eventually replace the device and are looking for an excuse ;) )
My direct experience is somewhat out of date, but from an engineering perspective the unit I have is much simpler than any TV, since it lacks a tuner or any fancy video scaling capability, and has no audio capability of any kind (that was a feature to me, since I use an A/V Receiver for sound). I think in general screens meant for signage are probably brighter than most TVs/monitors, but depending on the room that could be a useful feature as well.
