"Best" starts holy wars between zealots for each "material religion" and so I will avoid using that term. Every person who makes a "rain proof" related gear decision has an implicit hierarchy of musts and wants. The chart is just data; it is not a score of musts and wants.
If your primary objective is the longest "rain proof" life (defined to be an aged HH > 1,500 mm H2O) then, the chart data shows which materials exhibit that characteristic. For the average thunderstorm, you don’t need more than 1,500 mm H2O to be “rain proof”. In other words 1,700 mm won’t keep you drier than 1,500 mm H2O. You mentioned some, but not all of those materials in the chart that meet your criteria.