What kind of capture cards would be the best for recording games on the wii and wii u

get an hdmi adapter for the Wii, then you can use any card that supports hdmi input. for futureproofing I'd suggest you'd get a card that can do 1080p@60FPS with possibly higher resolutions available.

ElgatoHD, Roxio Game Capture, and AVerMedia (just to name a few). The best thing I recommend is searching on Google for them. Some capture cards will give you HD quality, but can lag your operating or gaming system, so it's best to know what your Wii/Wii U (as well as whatever you're recording it too) can handle. :)