I have worked with Raspberry Pi computers and consider the 400 to be an excellent choice for a second or third machine in a house. It browses the web well, reads email like a champ and can do wonders with word-processing or spreadsheets. This year, there is a new inexpensive general purpose computer on the block (from a competitor), the orange Pi 800 featuring the Rockchip RK3399 System on a chip processor.
Where the Raspberry comes with Raspian Linux, the Orange comes with Orange Pi OS (both will run various versions of Linux). Orange Pi OS is a variant of Android that can be set to look just like Windows 11 or Mac OS or IOS, or, presumably, just like your smart phone. Early reviews of the Orange 800 indicate it is a bit faster than the Raspberry 400 and offers a great platform for those whose needs can be met by internet based access. Both of these can be had for around $120 (with shipping) and are designed to connect to your modern Television.
Throw into the mix a variety of Chromebook choices in the $100-$300 range and this is a great year for upping the flexibility of your TV. Any of these three types of devices can stream video from your favorite service, browse the web, etc.
There is a subtle difference in color, maybe not obvious in the above photos, along with a few different ports on the two devices; though, both devices provide ethernet, USB 3, camera card port, and a keyboard (computer located inside using the keyboard case as a heatsink). In addition, both provide wifi and bluetooth.