What are capture cards people use to stream Wii-U I am thinking of speed running some Wii-U games in the future.

I use elgato but their are better ones just search up capture cards and you should be able to find one which supports the Wii-U system

That is a really bad advice you are giving this user. First of all, is it only the wii u that you are planning to capture? In that case you do need a capture card that supports HDMI capture. Second then, do you want an internal capture card or an external one? Whats your budget and what does it need to do for you?