I prefer 24/0. In my experiences, the plants grow larger and much faster. Mine have never been stressed by a 24/0 regiment.
This question has been asked a lot... so I decided to experiment. I had 2 rooms with the same exact plants, equipment, space and set up. One was set to 18/4 and the other was set to 24/0. The plants in the 24/0 room were ready for flowering much much sooner that the others. They were bigger and bushier. The difference was dramatic.