You want Sunbrella Plus (Supreme is nice too) on the bimini and then regular Sunbrella for the side curtains. The Plus is waterproof (as is the Supreme... only flocked), which in my opinion is worth it for the bimini.
One other important design consideration is the direction of the seam(s) in your bimini. For areas with rain, you want to have the seam(s) running fore/aft and the crown of the bimini set so the water beads each cross the seam perpendicular rather than water running down the seam. It's less prone to leaking that way, but your seam is more visible. A trade off for wetter climates. Often in climates like California, they'll hide the seams right on top of each bow and run them athwartship.