"Best" here means the most badge points a finished build can have, because badge points are the game's own measure of how much a build unlocks. We search every height, wingspan, weight, body type and anomaly at each position and keep the highest. These are the current results; they change when a game update changes caps or badge requirements.
Point Guard: 165 badge points
The best Point Guard body we found is 5'9" with a 5'9" wingspan at 160 lbs, Slim body with no anomaly. It unlocks 29 badges: 10 Playmaking, 9 Shooting, 7 Defense and 3 Finishing. By body type the best possible is Built 165, Narrow 165, Normal 165, Slim 165 and Bulky 162, so body type barely matters here.
The strongest ready-made preset at this position is PG Sharpshooting Playmaker with 153 badge points, 12 short of the best.
Shooting Guard: 158 badge points
The best Shooting Guard body we found is 6'5" with a 6'5" wingspan at 185 lbs, Slim body with no anomaly. It unlocks 29 badges: 10 Playmaking, 9 Shooting, 7 Defense and 3 Finishing. By body type the best possible is Slim 158, Narrow 157, Built 152, Normal 151 and Bulky 148, so Slim is worth 10 points more than Bulky.
The strongest ready-made preset at this position is SG Sharpshooter with 153 badge points, 5 short of the best.
Small Forward: 156 badge points
The best Small Forward body we found is 6'9" with a 6'9" wingspan at 205 lbs, Slim body with no anomaly. It unlocks 33 badges: 9 Shooting, 9 Playmaking, 8 Finishing and 7 Defense. By body type the best possible is Slim 156, Narrow 155, Normal 152, Built 149 and Bulky 148, so Slim is worth 8 points more than Bulky.
The strongest ready-made preset at this position is SF 2-Way Slashing Lockdown Defender with 124 badge points, 32 short of the best.
Power Forward: 169 badge points
The best Power Forward body we found is 6'9" with a 6'10" wingspan at 290 lbs, Bulky body with the Shooting anomaly. It unlocks 31 badges: 9 Shooting, 9 Playmaking, 8 Finishing and 5 Defense. By body type the best possible is Bulky 169, Built 162, Normal 162, Slim 159 and Narrow 157, so Bulky is worth 12 points more than Narrow.
The strongest ready-made preset at this position is PF Two-Way Inside Force with 128 badge points, 41 short of the best.
Center: 192 badge points
The best Center body we found is 6'9" with a 6'9" wingspan at 295 lbs, Bulky body with the Shooting anomaly. It unlocks 25 badges: 9 Shooting, 8 Playmaking, 5 Defense and 3 Finishing. By body type the best possible is Bulky 192, Normal 189, Built 185, Slim 184 and Narrow 180, so Bulky is worth 12 points more than Narrow.
The strongest ready-made preset at this position is C Rim Protector with 123 badge points, 69 short of the best.
What the best builds have in common
They are specialists. Each one takes the attributes behind its most valuable badges close to the cap and leaves the attributes it doesn't need at 25, because a point above 89 costs 3 times as much of the build bar and there isn't room to be good at everything. One thing they share: every position's best build has all nine Shooting badges.
Most badge points isn't the same as best for you. A build with fewer points and the takeover or the speed you want can play better. In the builder, Find the best build answers questions like "best PG that still has 85 speed" or "most badge points with Limitless Shooter at Gold", so you can keep what matters to you and get the most out of the rest.