Well as far as I'm concerned, I feel that right handed players can see the balls better when breaking on the right side of the rack as you look at it.
When I break the opening break I break to the right side of the rack and focus my concentration on the left side end ball hitting the left long rail and returning to the rack. That is my shot objective and primary ball focus. The rest takes care of itself so long as I focus on that left outer ball contacting the left long rail square.
Contacting the end right side ball gives me better vision to do that.
You shouldn't even attempt an opening break without checking that the last two rows are frozen in an important game. Hitting a mush rack is suicide no matter which side you choose.
As was mentioned, with a correct break the CB should travel 3 rails and come to rest on the 4th rail (head rail). So it wouldn't matter much to the oncoming player as they can reach easily from there no matter which side.
Don't try to have the CB go 3 rails as in... foot rail, right long rail, and head rail. You need to hit that non adjacent left long rail to put the brakes on the CB and leave your opponent long. That's important.