Soil, soil, soil!
For taste and full flavour, organics and soil can't be beaten in my opinion, thats why I am Organoman!
As Mr. Stinky said, hydro might be a commercial growers choice, but for connoisseurs and personal use, eveything as natural as possible will give you that special smoke you desire. If you can grow outdoors in sunlight, even better!
All my older friends, myself and more experienced tokers (20+ years of inhaling) all search out and much prefer an outdoor, soil grown supply and there seems to be a definite and compelling movement away from hydro by nearly everyone I know.
While the yields in soil may be slightly less, the quality more than makes up for it.
As with anything, there is a lot to growing good cannabis with soil, it is a learning curve, just like with hydro, but once you get your head around growing with soil, it becomes quite simple. Things will happen more leisurely, especially feeding, but if you want the best - good things take time.
If you just want to pump out as much product as possible, as quickly as possible, and don't care too much about what you are smoking, stick with hydro, but if you want velvet chocolate, organics and soil is the only way to go in my opinion.
The biggest tip I can give you is to use prime ingredients and not skimp on quality, you can't grow good weed in cheap dirt!
Hope this helps, Organoman.