The sail material and your most frequently used locations should be considered,
as well as the skills of the pilot.
All the masterpiece kites to date have been created out of nylon. A vented masterpiece model is highly unusual as well.
Actually, not all of the Masterpiece kites were made out of nylon, there were a couple that were made out of Poly and even Icarex. The Martin Lester is one of those that is made out Icarex. There were a couple others but I will have to look to see which ones. I believe the Elliot Shook revs are poly. the 20th Anniversary Rev Masterpieces are a mix of Poly and Icarex.
Most masterpiece are nylon and only a few of those were available as vented.