Westerman, all else being equal the sharper radius of the 0015-33 option will stall a trifle sooner with a cleaner break.

Which is better for you depends on how you want to fly. If you want to do really tight high G turns and tight fast loops without snapping out of them the -63 nose will do more for you. If you enjoy snaps and want to get into the now popular post stalled 3D style flying where you want the model to stall on command and dump the flying energy fast when going from normal to post stalled maneuvering then the sharper -33 nose will help with that.

Mind you for the 3D stull the current vogue is to go with thinner airfoils than 15%. The idea seems to be to get closer to a flat plate but still keep the airfoil thick enough to contain a decent spar system. It seems like many models of this sort are showing up with 10 to 12% airfoils.