Slot cutter question

Freud Slotting Cutter Sets · These Freud router bits include three wing slotting cutter, arbor and a ball bearing · Cuts all composition materials including:

Saipe 5pcs T-Slot Cutter Router Bit 14 Inch Shank Keyhole Router Bit Set with 14 & 516 & 38 & 12 & 916 Inch Blade Diameter for Wood Hex Bolt T-Track

124 scale slot cars Powercraft powercraft router bits for wood circular saw blade carbide tip router bits for wood set 1 4 crossjoint propeller tractor router bits for

1_4 slot cutter router bit Is there an advantage to have the bearing above or below a 14 cutter router bit I want to use a router to cut a 14 slot