If soil grown weed & hydroponic weed were both grown by growers with equal grow skills then both types have the possibility to be just as good as each other,one type grow method will not stand far above the other.
But this is normally not the case,normally commercial growers who use the hydro growing method are a pretty skilled bunch,they have to be,they also have 100% control over the growing conditions as well as 100% control over when to harvest for best high.
These are things most commercial soil growers do not have much or any control over,no matter how skilled a commercial soil grower is his skills cant control climate & in many areas of the world harvest date depends on weather,not when the plants are ready,this applies to commercial soil growers who grow outdoors,not in a indoor grow room or green house.
If all things are equal both types are near the same,if not then hydroponicly grown commercial should a better quality smoke.