Wide screen video is better because it is more realistic and better to look at because it gives you a Panoramic view of the video. There are many device that can play Wide screen video like the Sony PSP Hand Held console, Smartphones, Tablet computers, Portable video players, and laptops.
But, most of the devices I mention are expensive except for the Sony PSP handheld game console which you can buy for under 90 dollars on Amazon.
However, it would be great if you can watch widescreen video wherever you go by carrying the device in your pocket. The PlayStation Portable 3000 Core Pack System would be a good choice for your portable wide screen video on a portable device. The PSP can be used to playback MP4 video files, MP3s, and other media file types which you load into a memory stick. It also is a very fun portable hand held gaming console which you can use to play hundreds of games on, or use to surf the Internet with wireless internet from a wireless hot spot with its built-in browser.
The Sony Playstation Portable is sleek, portable, and lightweight, but have enough power for playing back high quality video clips and games for hours when you are on the road.