Durabak looks nice but is very difficult to keep clean. Spoke with the Kangaroo chasers from New Zealand @ Kiwi-grip and their product does seem better than Durabak and only requires one coat. Awlgrip is good but its a PITA trying to get the right amount of grit in it so as not to cause your feet to bleed.
No matter what ya use,prep is the key to making it stick correctly and last.