Both would work the same. It's good to do small lines and alternate nostrils. The stuff is absorbed by the mucus membranes in your nose and if you do too much in one nose, the membrane will be covered and your powder will go straight into your stomach.
For me, Righty is practicaly dead. I used to always use righy when i was doing coke and made myself a nice hole. So now anything that goes in there burns like a motherfucker . . .