It you get a nice Tv a remote may helpful and if it’s used as photo frame roll over magic mirror and it may have two HDMI socket it can be used a second screen for pc and its cheaper. Most monitors only have one Hdmi in low cost range . If their used as mirror in my opinion if you can get laptop screen with a drive board its best as its so slim . Monitors are slimmer then tv’s but can cost more ,pictures quietly is not an issue a you most seeing the mirror.
Deciding what best depends on your pocket if you go with glass it’s much better than film the cost between acylic or glass is about 25 pound more if you look around . It’s more about weight it can get very heavy.
Best thing to is it up a Tv you have and get it all working with add-on modules on the same size your going to use
Hope my opinion has been helpful