The Roku Express 4K Plus is the best streaming device overall right now. We prefer Roku's content-agnostic approach, ease of use, large app library and excellent search functionality over those from other companies. The Express 4K Plus is also usually the cheapest Roku that offers 4K HDR streaming.
For example, if you're using an Android device, you must go into Settings > Display > Cast menu and enable it from there. On iOS devices, this can usually be found under Control Center > Airplay (or Screen Mirroring). With your phone enabled for screen mirroring, it's time to turn on your smart TV's feature.
Unfortunately, Grand Theft Auto V is not available on the PlayStation Vita. It was released for the Xbox 360, PlayStation 3, Xbox One, PlayStation 4, and PC. It was not designed for the PlayStation Vita's hardware, and therefore cannot be played on it.
The Sony Playstation Vita still has a nice design and can provide a good gaming experience, despite being a device from ten years ago. The console's ergonomics and size provide a comfortable gaming experience, even during long hours of play.