Steven Adams is currently the best rebounder according to 'STATS.NBA.COM'.
Russell Westbrook backed up the stat:
He's the best rebounder in the league... he does an amazing job of getting himself in position, using his body, sacrificing his body and keeping balls alive.
The kiwi is number one at an average of 11.5 boxouts per game while Enes Kanter and DeAndre Jordan are close behind with 9.5 and 8.8 boxouts respectively.
A perfect example of how impressive Adams is was their most recent 111-110 overtime victory against the Mavericks where Adams claimed 12 rebounds.