Generally speaking, wing mounted engines in pods, provide for a lighter wing structure, than would otherwise be required...they provide wing bending relief.
In addition, fuel, electrical, hydraulic and bleed air installations are somewhat simpler/lighter with wing mounted engines.
Aft mounted engines have advantages of course...one of the main considerations being shorter/lighter landing gear.
Also, the wing design allows for a smoother airflow distribution.
Compromise...the watchword in aircraft design.