that depends on what you mean by 'better.' I don't know any HPS bulbs that produce truly white light, only amber. But blue/white light is best for veg, amber/red for flowering.
are you confusing metal halides and high pressure sodiums? hps lights have an orange-ish tint to them, whereas metal halides are white with a blue-ish tint.
are you confusing metal halides and high pressure sodiums? hps lights have an orange-ish tint to them, whereas metal halides are white with a blue-ish tint.