I didnt see a power panel like add on to the Medusa, and that right there would win it for me. The power panel with the eagle tree turns your logger into an instant watt meter, and allows you to view max or mins of your parameters after a flight without the need for a computer.

With the power panel I rarely even plug the logger into the computer anymore since most of what I am really interested in is displayed on the power panel anyways.

If the Medusa has a power panel, then it seems like a toss up unless the software is significantly better or worse.