Although have downloaded the corel one I have not bothered to install and test it. Perhaps others who have used it might add their feelings.
Back in 2011 I did a survey of different screen recorder programs looking at the claimed features and then preparing a short list and testing those.
Wikipedia had a comparison listing of a lot of screen recorders.:
http://en.wikipedia.org/wiki/Comparison ... g_software
These were the ones I looked at:

From those considering price and zoom functions, ease of use from default settings I made a short list which I downloaded and installed and tested.

From these my final choice was
BSR Screen Recorder
