iMovie "Picture in Picture" Video "Quick Takes"

This is a neat assignment we are tackling in my Electronic (Digital) Media Production II class. Weeks ago, the students did a green screen project blending photos of themselves with background images under the general theme of "Where Do You Want To Be?"

Now, the stakes and skills have been raised with this new green screen "Quick Takes" project. The idea is to gather three short video clips on three different topics, one of which has to be a timely news or sports story.

Then the students, using their smart phones or other cameras, shoot themselves or have a classmate videotape them against a green screen as they give their comments and thoughts about the video they speak over.

For this project, we are using iMovie, which is available on the Macs in one of our program labs.
Here's what I put together to help give the students a better idea what this assignment involves.

I found iMovie very user friendly for this project. I look forward to seeing what my students produce!

The above video was rendered to QuickTime. The below video is an MPEG4. I'm trying to decide if one looks better than the other.