Since 1978-79, Patrick McCaw has the best winning percentage in the playoffs when playing 25+ games, winning 87.5 percent of the time.

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which player has the highest playoff winning percentage since 1979 with 25 games
Interpreted as:
Which player has the highest playoff winning percentage since 1979 with 25 or more games?
McCawWaltonMcAdooSpriggsBrownKingBellKupchakClarkCookLooneyIrvingMcAdooGreenThompsonMcGeeMcGeeCurryHarperRodmanCaffeyCooperLoveLivingstonAbdul-Jabbar.875.821.808.800.787.754.750.737.732.725.714.714.712.699.699.694.691.688.688.686.686.685.683.683.681
NAMEGPW%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Patrick McCawPatrick McCaw32.8757.72.21.20.60.40.10.10.71.741.80.30.833.30.50.588.2245703920133419+7
Bill WaltonBill Walton28.82114.05.64.81.30.30.61.12.44.255.90.00.00.00.91.364.9393156134379163068
James Michael McAdooJames Michael McAdoo26.8084.01.31.00.10.20.20.10.50.954.20.10.240.00.20.450.01043325255311-34
Larry SpriggsLarry Spriggs30.8009.95.02.31.30.20.21.11.83.551.90.00.10.01.31.776.52971496840563350
Randy BrownRandy Brown47.7876.01.60.60.50.30.10.40.61.538.60.10.150.00.40.573.92817429221531846-70
Stacey KingStacey King61.75411.84.32.20.50.30.20.81.53.739.20.00.150.01.41.973.77192641363121155098
Jordan BellJordan Bell32.7508.72.62.10.80.30.50.31.12.054.00.00.00.00.40.858.32798266261016831+32
Mitch KupchakMitch Kupchak38.73712.14.33.30.30.20.20.61.73.647.40.00.00.00.91.561.445916512612792472
Ian ClarkIan Clark41.73213.76.01.30.90.50.00.72.34.847.50.72.035.40.70.890.356324553382222955-17
Quinn CookQuinn Cook40.7259.84.11.10.70.20.10.31.63.742.90.51.729.00.50.686.43921654228731227-42
Kevon LooneyKevon Looney42.71419.55.64.40.90.60.50.52.53.962.40.00.00.00.71.258.081823518339261921100+154
Kyrie IrvingKyrie Irving70.71436.423.43.64.81.40.62.28.618.945.52.36.039.33.94.488.32,5461,6392513379841155158+413
Bob McAdooBob McAdoo66.71222.313.25.30.80.71.31.85.510.750.90.00.125.02.33.172.71,472871349564689122208
Draymond GreenDraymond Green123.69935.612.59.36.11.61.52.64.49.944.51.23.731.52.53.473.74,3761,5361,149754197180325458+888
Klay ThompsonKlay Thompson123.69937.219.34.02.21.00.51.87.216.244.23.07.341.51.92.284.14,5702,37248627211966220336+554
JaVale McGeeJaVale McGee62.69412.65.44.00.40.31.10.72.33.959.90.00.10.00.71.452.978333524723186941118+166
Mike McGeeMike McGee68.69112.37.11.60.80.30.00.83.05.950.30.30.934.40.91.561.28384861095523354100
Stephen CurryStephen Curry112.68837.826.55.46.31.60.33.58.719.445.04.210.540.14.85.390.64,2352,96860470418130390282+777
Ron HarperRon Harper112.68826.89.03.72.71.30.71.13.57.945.00.51.729.21.42.169.83,0001,01341730514176121245+206
Dennis RodmanDennis Rodman169.68628.36.49.91.20.60.61.52.65.349.00.00.314.91.12.154.04,7891,0811,67620510697258630+127
Jason CaffeyJason Caffey35.68613.33.13.30.80.20.20.81.12.740.60.00.00.91.368.946410911629682771-48
Michael CooperMichael Cooper168.68528.29.43.44.21.20.61.53.57.446.80.71.939.21.72.182.54,7441,58157470320396252474
Kevin LoveKevin Love63.68331.115.39.71.80.70.51.75.012.340.32.25.540.43.23.785.41,9589666091164634105150+329
Shaun LivingstonShaun Livingston126.68319.46.42.62.40.40.21.02.65.250.70.00.128.61.21.481.92,4508093322975428129244+177
Kareem Abdul-JabbarKareem Abdul-Jabbar166.68134.321.77.82.90.92.32.68.816.353.80.00.00.04.25.576.25,6943,6081,289484148387433569