zig zag's are the easiest, really good paper
i must say i focus on structure of the joint,
how does the paper hold the yerba before smoking it?
how does it burn?
does it hold the weed nicely while smoked?
does the mouthpiece get drippy and clogged?
does it burn fast or slow while smoking? when not smoking?
personally i like rolling very good joints and hence i tend to take my time (my buddies hate it),
i like them to be perfect, slightly broader towards the tip (yeah like a cone), small filter for mouthpiece, i hate dealing with roaches.
and for this the best paper is by far OCB's
OCB's burn really good and have the best sizes available.
not for beginners though.