I actually spoke about this subject, and why I prefer BB86 and T47 inboard, in a thread back in February
https://chinertown.com/index.php/topic,6990.0.html
From @toxin
"From an engineering standpoint, yes BB86, 386EVO are better. If anything BB30 and BBRight directfit could even be considered superior, because the bearings are pressed directly into the frame, with no cups. The best would be dimensioned similar to 386EVO with the bearings pressed directly into the frame like BB30.
But that's in an ideal world. The reality is that the majority of the bike industry has simply proven too unreliable to consistently produce such standards to spec, so we're back to threaded. T47I is the closest compromise in that regard.
Personally I'm not a huge believer in driving stiffness. Humans are far too weak for there to be meaningful power transfer losses. I don't discount the fact that there is a subjective difference in the feeling of riding between bikes, but I do discount that it makes an objective difference."
https://chinertown.com/index.php/topic,6990.0.html
From @toxin
"From an engineering standpoint, yes BB86, 386EVO are better. If anything BB30 and BBRight directfit could even be considered superior, because the bearings are pressed directly into the frame, with no cups. The best would be dimensioned similar to 386EVO with the bearings pressed directly into the frame like BB30.
But that's in an ideal world. The reality is that the majority of the bike industry has simply proven too unreliable to consistently produce such standards to spec, so we're back to threaded. T47I is the closest compromise in that regard.
Personally I'm not a huge believer in driving stiffness. Humans are far too weak for there to be meaningful power transfer losses. I don't discount the fact that there is a subjective difference in the feeling of riding between bikes, but I do discount that it makes an objective difference."

