This is not all telling but you can sort 2-man line up stats. I sorted by the best total +/- for each team:
1. UTA Gorbert/Conley 1368 min / +528
2. PHI Embiid/Simmons 1164 min / +393
3. LAC George/Leonard 1028 min / +378
4. DEN Jokic/Murray 1363 min / +339
5. MIL Giannis/Middleton 1452 min / +322
6. PHO Booker/Bridges 1870 min / +279
7. GWS Green/Curry 1738 min / +278
8. POR Covington/Lillard 1805 min / +257
9. ATL Collins/Young 1455 min / +239
10. BKN Irving/Harris 1293 min / +196
11. MIA Butler/Robinson 1177 min / +190
12. MEM Valanci'/Brooks 1314 min / +165
13. LAL James/Schroder 816 min / +162
14. NYK Randle/Bullock 1811 min / +122
15. NOP Williamson/Ball 1114 min / +112
15. SAS Poeltl/Murray 1307 min / + 106
16. TOR Siakam/VanFleet 1466 mn / +96
17. BOS Tatum/Brown 1263 min / +79
There are a number of top duos that either didn't have the minutes to qualify for my sort or that were on lesser teams that just didn't have the same level of +/- success. Also, for many of the teams, they had more than one 2-man group that did very well. For example, Utah had 7 of the top 10 and Gobert was part of 6 of those 7. Again, I just listed the top one for each team.
I also note that most of these duos include one big. 12 of the top 17. I did a per 36 sort to normalize against time but that really did not change things all that much. Utah/Gobert were still most of the best duos. Harden and Durant are clearly a top duo but this didn't make my sort due to not enough minutes on the floor together. Lillard/McCullom were 1068 min/+221, not the best on POR for total but best per 36 on POR.
Tatum and Brown did not fare so well in this comparison.
Above is a tell-tale sign. It's all about making the players around you better, pushing them to be the best they can be. Just as this real plus/minus comparison is:
1 Stephen Curry, PG GS 63 34.2 7.08 0.10 7.18 19.05
2 LeBron James, SF LAL 45 33.4 4.63 2.10 6.73 11.91
3 Rudy Gobert, C UTAH 71 30.8 -1.45 8.00 6.55 16.52
4 Paul George, SG LAC 54 33.7 1.55 3.89 5.45 11.98
5 Giannis Antetokounmpo, PF MIL 61 33.0 3.89 1.20 5.09 14.03
6 Nikola Jokic, C DEN 72 34.6 3.12 1.96 5.08 15.85
7 Joel Embiid, C PHI 51 31.1 2.04 2.98 5.02 10.01
8 James Harden, SG HOU/BKN 44 36.6 3.99 0.98 4.97 9.94
9 Damian Lillard, PG POR 67 35.8 3.88 1.09 4.97 14.55
10 Lonzo Ball, PG NO 55 31.8 3.19 1.27 4.46 10.06
11 Mike Conley, PG UTAH 51 29.4 1.25 3.12 4.37 8.28
12 Fred VanVleet, SG TOR 52 36.5 1.27 2.78 4.05 10.67
13 Kyle Lowry, PG TOR 46 34.8 2.90 1.12 4.02 8.98
14 Kevin Durant, PF BKN 35 33.1 4.07 -0.11 3.95 6.06
15 Devonte' Graham, G CHA 55 30.2 1.92 1.97 3.88 9.24
16 CJ McCollum, SG POR 47 34.0 2.09 1.78 3.87 8.42
17 Ben Simmons, PG PHI 58 32.4 1.28 2.39 3.67 9.80
18 Chris Paul, PG PHX 70 31.4 0.48 3.06 3.54 10.78
19 Jamal Murray, PG DEN 48 35.5 0.41 3.07 3.48 8.04
20 Kyrie Irving, PG BKN 54 34.9 2.96 0.49 3.44 9.16
21 Jimmy Butler, SF MIA 52 33.6 1.50 1.90 3.40 8.70
22 Julius Randle, PF NY 71 37.6 -0.76 4.16 3.40 12.36
23 Joe Harris, SF BKN 69 31.0 -0.60 4.00 3.40 10.14
24 Clint Capela, C ATL 63 30.1 -1.63 4.98 3.35 9.12
25 Zion Williamson, PF NO 61 33.2 1.07 2.13 3.20 9.45
26 Christian Wood, C HOU 41 32.3 0.54 2.60 3.14 6.19
27 Bam Adebayo, C MIA 64 33.5 -0.77 3.78 3.01 9.56
28 Luka Doncic, PG DAL 66 34.3 2.44 0.51 2.96 10.37
29 Duncan Robinson, SG MIA 72 31.4 -0.56 3.45 2.89 10.04
30 Terry Rozier, SG CHA 69 34.5 1.29 1.59 2.88 10.77
31 Jaylen Brown, SG BOS 58 34.5 2.10 0.71 2.81 9.39
32 Danny Green, SF PHI 69 28.0 -0.87 3.67 2.80 8.28
33 De'Aaron Fox, PG SAC 58 35.1 2.92 -0.27 2.66 8.85
34 Kyle Anderson, SF MEM 69 27.3 0.16 2.44 2.60 7.82
35 Jrue Holiday, PG MIL 59 32.3 1.80 0.77 2.57 8.64
36 Kawhi Leonard, SF LAC 52 34.1 1.46 1.10 2.55 7.55
37 Donovan Mitchell, SG UTAH 53 33.4 3.26 -0.76 2.50 7.52
38 Zach LaVine, SG CHI 58 35.1 1.82 0.65 2.47 8.78
39 Tobias Harris, PF PHI 62 32.5 -0.20 2.65 2.45 8.21
40 Jayson Tatum, SF BOS 64 35.8 1.06 1.39 2.44 9.60