The pros and cons on this subject have been debated for years.

Pros for the pusher
- the fuselage is working in clean air, so it is easier to have laminar flow for low drag.
- the high speed air from a prop (about 10% faster than the airspeed of the airframe) is not going down the fuselage for lower drag too.

Cons for pusher
- prop working in dirty air, with uneven pressures so efficiency goes down
- need really long heavy landing gear or you can not get down to stall speed for landing.

Pros for the tractor
- best performance from prop
- turns out that the air from the prop tends to go laminar between mini wakes of turbulance from the prop.

All the really fast prop airplanes have always been tractor designs.  Nothing likely to change.