I'd say Durant. Carried the Nets through Kyrie's bullshit and Harden's injuries. Averaged 27, 7 and 5 with a PER of 26.4. Compared to LeBron who averaged 25 7 and 7 with a PER of 24.2.
Both missed a ton of games.
You do realise KD didn’t hit half the season in minutes. Harden was the one who carried the Nets.