|Even if we got a legitimate 100-0 / 60-0 stopping distance on one of these BBKs that was better than stock - that's stock with factory pads and OE tires.
These kits don't fit under stock wheels or OE tires (as they are NLA)
You won't be comparing apples to apples, just that it's better than OE from the factory.
Unless people start publishing legitimate stopping distance and their specific configuration (caliper, tire, pad, car weight, suspension) we will never know what is best - and with the endless configurations it is unlikely a "best" will ever be established.
What we can pretty well establish is that larger components are capable of increased clamping force, increased leverage, and increased ability to dissipate heat to reduce brake fade. The key is not just making it bigger but making it balanced and functional as you previously noted.
Until then everything is anecdotal and conjecture.
FWIW going to 17Z front and SRT8 rears with 14" rotors yields a 65% front bias compared to stock of 63%. That 2% could be good, it could be bad, or otherwise? meaningless - however unless we see some hard data you really can't say they are better or worse (with the exception of a fade reduction is going to be present due to the larger size of the components).