All I can say is look at this discography
To me this says it all. The diversity of the artists that Steve Gadd has worked with is off the charts. And we're not talking being hired to perform here, that's a side-bar. Gadd is hired to make music and stamp it in stone when the record button is pressed.
I would take Gadd's infinite musical wisdom, innovation, incredible grooves and sublime sense of rhythm over any amount of chops, any day of the week. When I hear Gadd play, I am hearing is a living, breathing rhythmic GPS device that knows where a song a going and how it's going to end. Yet at the same rate he is incredibly present and musically in the moment.
All of this is no knock on Vinnie or Dave. They are fantastic drummers, & I am sure they would be the first to tell anyone that what Steve Gadd has and what he has done is what matters most.