Advice on whether to use Legacy Camera or current camera and general advice for 6 simultaneous cameras

First of all I don't understand the difference between legacy camera mode and modern camera mode.

I could have them all as Legacy cameras all as modern cameras or mix of them and I don't know which one is best for my situation

I have three windows of camera from three different angles a handcam a face cam and a money cam sometimes when I don't have hands to put on the camera like what I'm exercising for dance games or remotes or Kinect, I'd like to change my hand camera to my sweat cam.

I do not do transitions in the middle of the broadcast I just let it run and go all the way through no camera adjustments The only cameras I'm swapping out is the hand cam for the sweat cam depending on What type of game I'm playing whether I'm playing with my hands or whether I'm playing with my body.

That being said I understand in general the less processing done by the computer the faster everything goes and the more stable every connection is. I should try to use the real size image instead of blowing up or shrinking down the image cuz that takes processing power to make it fit in 16x9 just use crop and take off enough borders on the top and bottom to do a 640x480 mode. Also what a camera read better if it's a native 320x240 or would a shrunk it down 640 by 480 be better? (With the appropriate 16x9 cro)?)
 
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