I vote with the majority. Rig the airplane first.

One thing to do first when beginning the rigging task. Connect the pushrod to the inside hole on the servo arms, first thing. Only time to do that otherwise is if your assembly manual pictures your exactl servo and arm and shows otherwise AND says otherwise AND explains why. Next, connect the pushrod to the outside hole on the surface's horn. THEN check the throws and go from there.

There is an excellent article in one of this month's RC magazines on rigging. It shows a chart with the different holes connected. The chart shows how doing it the right way increases the servos effect on the surface. It shows also how much you degrade the servo power and speed by rigging the wrong way. Most people who rely first on their computer radios for adjusting throws without starting with the airplane rigging wind up defeating their decently powerful servos before they ever fly them.