I`ll leave Victory out of the comparison, simply because we still don`t have any full pro performance.
Well, let`s go on to the others. Just a personal analysis by me:
Vocal: BAD era
Energy: Dangerous
Dance: HIStory
During the BAD tour he was still looking for the best way to perform Billie Jean after the Victory performances (which he didn`t like, because the stage wasn`t according to his wishes). Anyway; the vocals were perfect; just listen to yokohama..his voice only fails during the 'stood right by me'-turn at the middle of the song, wich is natural.
He obviously peaked at the Dangerous era.. A LOT of power in the dancing and a ,somewhat, raw voice..
Then compromising during the HIStory tour for his voice by improving the dance at the end routine.. MJ is known to compromise during his performances; when something goes wrong, he puts more power in what comes next/after..
plus;
The 'MJ & friends performances', where he combines more of his Victory moves (old style circle slide, it isn`t the BAD era one like Yokohama..) but prerecorded voice..
I won`t count the 30th performances, since he was on the painkillers/backpains during that era.. but even in the amature footage you can see he is trying to more more during the end routine, because the overal performance wasn`t that great..
I`m still hoping for (at least) pro audio from the Victory Tour, since i like the more 'electric' instrumental sounds and bassline during that era.