I am not pro @ this, but one thing you should check out is the recording resolution for those capture cards. From the spec it looks like the expensive card can record @ 720 x 480, while the cheaper one can only do 320 x 240. You should also check out the actual recording frame rate. Although both capture card listed it as 120FPS, you need to check and see @ what recording resolution it can do 120FPS. Just some ideas to help you get started.