Do not use a desktop that requires hw acceleration in any computer, because you want all the hw power for the applications. Xfce is light, fast, stable and freely configurable. With the Sunvell T95z Plus Amlogic S912 tv box the Xfce desktop and youtube videos works fine with help of 8 cpu cores. I have made the Debian testing Xfce distribution for my device. You can download it from here:
https://www.youtube.com/watch?v=UsNzZn-luc0