3/4 will need no bracing! That stuff strong!!
And yes get the textured stuff, I did not find the 3 hatch covers in the floor to be slippery, but they were smaller then the hole middle of the floor.
Now Up here were I am we have a place that sells Sea Board, same stuff!! Cheaper. and more colors. I have no idea what they charge or were you can find it in your area??
But maybe they can tell you if you call them??
They are at
http://www.jfreeman.com/cpg_seaboard.html