While underrated may describe Blatt, I think Kerr is the more well-rounded coach. Imagine how can a rookie coach achieve the best record in the NBA, have the most efficient offense and second most efficient defense in the league. Blatt may very well be the best coach in Europe. But still iba pa rin ang laro sa Europe and NBA. While Kerr maybe a first time coach, he has studied the NBA for a decade na rin both as a GM and a telestrator. Then he played in the league for more than a decade. So Kerr has better knowledge of how the game is played in the NBA.
I mean how can a rookie coach accomplish what he has accomplished this year in an obviously stacked up Western conference. It's not luck his team is on the brink of entering the finals. Imagine the coaches in the West... Pop, Doc, Brooks, Carlisle...these are coaches of the year and/or NBA champions. And Kerr is most probably the only one left standing in the west. Baka nga si Kerr pa yun underrated. Hindi siguro tsamba yun. Knowledge of the game talaga.
But Lebron is still Lebron. But sa coaching, the edge for me goes to Kerr. He seems always prepared.