I was just thinking about this situation I ran into yesterday;
My friends and I are defending on Hanamura. We're all fighting to defend A, and as I am chasing an enemy down to kill them, the point is captured. I kill the enemy, but we are already losing B; an enemy Genji had camped in B to get the process started quickly. As a Roadhog with no movement options, I ran the whole way back.
My question is, will it ever be quicker to jump off the map, die, and respawn? Or is running back the fastest way to do so? Is there any advantage of one way over the other, aside from the obvious flank from behind?