Phil also coached teams with Michael Jordan, Scottie Pippen, Shaquille O'Neal, Kobe Bryant and Pau Gasol. Nate, on the other hand, had teams with Ray Allen, Rashard Lewis, Brandon Roy and LaMarcus Aldridge.
You're talking about 5 first-ballot HOF'ers versus marginal all-stars at best ... so not exactly comparing apples to apples. At the end of the day, I doubt Phil could've done much better with the rosters (and injuries) that Nate's had to coach.