The Oceanic rigs all have aft-sloping luffs, which helps promote aerodynamic lift, and vortex lift on reaches. The Western rigs are easier to handle, the balestron being exceptionally so. The sloop is exceptionally slow to shunt, since the jib must be lowered on one end, then its duplicate raised on the other. Other sloops have used roller-furling jibs in place of the hanked on jibs of Russ Brown's proas. These sloops would rate a bit higher in Handling , especially in Ease and Speed of Shunting , but would rate lower in Performance .
Western rigs are more tolerant of back-winding, and most are able to tack as well as shunt.
This is no surprise, since the Western rigs are adopted from tacking boats. I am not certain that tacking ability is really an important feature once we become more familiar with proa sailing, but in a Western, tacking world, it would always come in handy. The Oceanic rigs tend to have shorter masts, simpler rigging, and drop the other spars to the deck, so they have less windage under bare poles. The exception is the shunting staysail, but that is really a Western rig that happens to place its CE forward of amidships. The Western rigs have reefing figured out, the Oceanic rigs less so.