The big advantage to port injection (v.s. throttle body injection) is that
you don't have the whole surface of the intake manifold covered with fuel.
With port injection the puddles are limited to the port area (including the
back of the intake valve).

I would say that the advantage of direct port injection is that the
computer puts exactly the right amount of fuel in that cylinder at the
exact right time. The injectors on my Mooney are running all the time,
the injectors on my Saturn only run (actually pulse) when on the intake
stroke. I've never seen aircraft injectors that had computer wires
going to them.

-Robert