The phasor diagrams are where the quantity (amplitude) and the angle (in time) is defined. The vectors are where the amplitude and the direction angle (in space) is defined.
Phasors (due to time dependence) are usually fourier transformed into a series of sine-waves with different frequencies. And the ones with different frequencies can not be as easily added up as the vector diagrams.
I am yet to treat (and not sure can treat) phasors having different angles in space ie a mixture of phasor and vector.
__________________
Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches