If you are choosing between a smart TV and a streaming device that pairs with a traditional TV, the biggest factor will likely be cost. A Roku Smart TV will connect directly to the internet with no need for additional streaming hardware, but it can be a pricey investment.
Alternatively, if you want to stream media to your traditional television, the easiest method is to hook up a streaming device like a Roku stick. A streaming player connects to the internet so that it can access your streaming accounts, such as Netflix, Amazon and Hulu, and it plugs into your television just like many other media players.
It is worth thinking about the type of internet connection you want when shopping for a streaming device. Smaller devices, like the Roku stick, connect via Wi-Fi, while larger ones can support a wired connection, such as Ethernet. Using a wired internet connection can be more stable and allow for higher resolutions when streaming content, but Wi-Fi streaming devices offer great convenience.