Right front, always. I don't care how old the bike is or how it's "supposed" to be done. I want most of the braking power in my dominant hand. As an added bonus, this means it matches my motorcycles.

It doesn't matter to me one way or the other. The bikes are how they are; I don't change that kind of stuff around.

Left for front as aside from most bikes coming from the factory that way, It really makes sense with calipers with their cable anchorage on the right side. Having the lever on the opposite side made it more possible to have a very smooth arc on the brake cable and housing from the (non aero) brake lever to the caliper, resulting in lighter and smoother brake action..... I also noticed that crossing over with the brake cable from one side of the caliper to the other seems to help keep the caliper centered longer.

I ride motorcycles too so it HAS to be right is front. I cant afford to grab the clutch lever for an emergency stop on the motorcycle. So all of the bikes are switched to match the motorcycles.

I have been riding motorcycles almost as long as I have been riding full sized geared bicycles, and I never had a problem transitioning front brake lever location from one to the other, every time I ride them. Don't know why, but it seems to be automatic for me to pull different levers when I ride one or the other....

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?

From a clean sheet of paper, right front makes slightly more sense, at least in lands that have driving on the right side of the road. But every bike I've acquired has had the opposite setup, so that is what I am used to. When/if I find myself with superflous time on my hands, I might try converting, but I'm not in a hurry. For me the biggest consideration is simultaneous braking and signalling, but I believe most vehicle codes exempt the cyclist from signalling if their hands are otherwise occupied, i.e. with controlling the bicycle. I use that one a lot.
I've ridden motorcycles too, but cannot recall ever experiencing confusion of the controls with those of a bicycle.

I have my bike set up left front brake that is what I'm used to I'm right handed but when it comes to squeezing brake levers I'm ambidextrous. What I learned from reading Bicycling Magazine in the 80's is the front brake is your main stopping brake if you need to brake in a hurry and lightly squeezing the rear brake will help to tell you when the weight is coming off the rear if it starts to skid.

Left, and why just for C&V?

Look, the only left-right issue I'm fully decided on: LEFT! maybe a weird Euro hobby anyway, but that's how I learned to ride and probably will do so for as long as I can swing my leg over the saddle.

This.

Well, Left shift lever is front derailleur, so Left brake lever is front brake. What is the problem with that line of thinking??? And yes, I used to ride motorcycles, too, so that argument is moot...

Some of us still do! But if I'm making a right turn I usually signal with my right arm. It's obvious what it means, and I figure most motorists today won't know what a correct right turn signal with a bent left arm means.

+2- on top of that, I'm left handed and like the touchier front brake in my dominant hand.

I have bikes done both ways. It's never been a problem for me.

Left front, right rear...after 40 plus years of riding bikes like that I don't want to change now! Why they did the brakes that way I have no clue.

Just to see if there was an old time wisdom in the way they put the brakes to levers way back when.

I have always had my rear on the right and front on the left. IIRC that is how my bikes were when I was little and how I always had them. I did buy a used bike once and when it arrived it was reversed, I tried it for a few rides but couldn't stand it. I was going to change out the bar/stem anyway so while installing longer brake cables I switched it back to 'normal'