Good and Cheap capture card that is easy to use?
i think easycap is a good one but im not sure.
I wanted to record the original XBOX as well if you were wondering...
For Wii U, i recommend Avermedia ExtremeCap U3 if you plan on using HDMI (or Component cables in general).
I've had it for maybe a week or two now (maybe more ? Not even sure), and it works great, both with OBS and with the software made for it (REcentral).
As for the original Xbox, i never had one so i have no idea wich cables it can use to begin with (component, RGB, etc).