What is the best capture card to use to record my gameplay from my wii? I have been trying to figure out the best one to use but they all seem really complicated to set up and use.

I use an Elgato HD30 that I got to stream Wii U. It's a bit expensive but works without any kind of cable splitting management and outputs HDMI to your display. Just make sure to set the console to 'Other' and select Analog input if you plug component of composite into it. It will also work with any other console if you want to stream a game from a different console in the future.

I and a lot of people use the GV-USB2, it pretty much has the best bang for your buck as far as Composite/S-Video goes. Many of the HD capture cards come with options to record Composite/Component, if you want to invest a bit more.

Just get one, they're all similarly 'complicated' to set up (not very) you usually just have to run an install disc, and there's information on youtube/google on how to set up most of them. What you do need are composite splitters (if you're playing on a CRT, like 99% of people are) which is basically a thing that you put the yellow, red, white cables of your game device into and then it splits it out to 6 cables, 3 for your tv and 3 for your capture device. If you don't have these you'll usually have a substantial delay trying to play on what your pc displays.

Thanks for the replies! What splitter would you say is the best?

This guide has a lot of information on streaming Retro games in the best quality https://docs.google.com/document/d/1Op8aK2RecKhjRJB7juOvwUjkXwBbL1eipxUpixBS2c4/edit

It includes links to cap cards, powered splitters, and even has a step by step guide on setting up other things like OBS to get the best quality out of your games. Ive used it in the past to improve some things for my own stream and recommend it to anyone who is just getting started.