It does not really matter if you want to run the cables left and right until you get to the tiller arm, if you run both down the same side the cables will travel the same direction.
Run down both sides the cables will travel in oposite diretions, the difference is, there will be more "slack" removed with both sides of the hull, you can still get the slack out of the cables on one side, but leaves "tiller slack" unadjustable...Just my.02c
GT