I've been searching the site for comparison of the various types of marine plywood, and I can't seem to find a string.  So, what's the consensus on the best type of marine grade plywood for a drifter.  I see a number of people mention the type they are using for their boat, but never (ok, maybe not never) an argument for why they chose one type over another.  Are some types better in certain conditions than others?  Is one more forgiving than another?  Does one hold a better natural color than another?  Or does it really matter, as long as you are getting "marine grade"?  

Any guidance would be greatly appreciated.