Smart TVs are upgraded traditional TVs that run on an operating system. The OS lets you access many other apps and online content in addition to your cable programming.
Audio, on the other hand, is an even playing field. The Roku and many smart TV models offer Dolby Atmos support for that ultimate home sound experience.
Because smart TVs are from various manufacturers, the user experience varies depending on which device you are using. So, there isn’t a ton of consistency in the kind of user experience they each offer, as every smart TV is different.