I wish I had started on a right-front bike. All the bikes I have bought or were given to me were left-front. By the time I had thought about the logic, I had so many miles on left-front bikes I knew there would be at least one bad crash from getting it wrong if I switched. So I never did.
Now, after my head injury, left-front was a plus. I had lost learned right hand skills (bruise on my motor nerves; putting my right side in seizure) so having my "educated but stupid" left hand on the important brake was better than having my completely illiterate right hand there. But it only took a couple of years before it was agian the smarter appendage.
Ben