difference between replay media catcher and replay video capture?

[joejohn]

I am having trouble understanding the difference between replay media catcher and replay video capture. I read the comparison chart on the official site but I still don't understand it. To me, it seems like they do the same thing.

another question I have is specifically about replay media catcher. I downloaded the trial version and played with it. my question is: When I press play in the video and the video is detected, do I have to stay on the video and keep playing it all the way to the end? or can I close my browser and the video will still record regardless?