Well it's a bit more of what you consider important. Do you care about the motorization, or are you content with pulling out the screen by hand every time you want to use it, or put it away?
I personally really like the look of Xenarc screens (although I haven't seen the IDT in person, so I'm going off my DWW-7VGA which is a re-cased Xenarc 700TSV). Xenarc has a good reputation around the forums, and seem to have fewer problems than other brands.
That being said, I do not know which LCD the MTSVO-SC is using so I can not comment on it's display quality.
Also, take some time and compare numbers between the two units. Contrast, Brightness, etc... and see if that helps you to narrow down which unit is right for you, because in the end the decision is up to you.