If the original poster likes the green one less in riding, check the fork length, axle to crown race. I bet it is longer and the head angle is more slack as a result. Later Medici bought out forks from Tange.
I own one, and it is a good bike. Medici does not get the notice that translates into decent resale value. The only one I know of that sold for a good price was one auctioned off by Ray Dobbins and it went to France, benefitting from being very well detailed and RED.
The history of the company from its origin to the end is a novel itself.