We put the three class-leading superbikes head to head at Thunderhill Raceway Park to decide the 2019 Cycle World Superbike Shootout winner. Will the 2019 Ducati Panigale V4 S retain it's edge in the category? Or will the all-new 2020 BMW S 1000 RR or big-bore 2019 Aprilia RSV4 1100 Factory take the crown?