pretty entertaining to see this split.

it's always been right/front for me.
just a memory on my hands and brain as i'd learnt when i was 5 from my daddy's bike.

somehow left-rear braking for me has always been stably reducing speed 'over' entire bike,
while right-front braking was more for sharp and absolute braking?
(and i've got to say i've been always unconsciously fearing of the myth of 'flying over the bars at a sudden right-braking'—which has actually never happened)

it actually gave me an headache when i built a fixed—that later became a SS—with
a double pivot DA front caliper with cable on the right + Paul e-Lever on the right not giving me enough arch for less-friction.
finally had to re-attache the lever to the left bar 'upside down'.
in fact, never felt comfortable of left braking for the front wheel ever since.

guess it really depends on the hand-memory = habit = how the brain got taught fist time. no?