When things go wrong, they go wrong quickly. No soil biology to buffer the system. You have to KNOW exactly what youre doing. Dont get me wrong, I love hydro for indoor novelty growing, but its likely to throw wild swings in ph, ppm, etc if youre not on top of it. Have a good ph/ppm meter, know your nutes, and use RO water if you want to be sure.
Now Im not saying a hydro plant couldnt win this competition either, it would just have to have a res the size of a 55gallon barrel with the best aeration youve ever seen. Hell just grow into a continuous 55 gallon batch of AACT! That would be how I did it.
Even then, Id still put flavors of the fruits fed by soil up against hydro any day.
CSB gave me a run for my money a few years ago with his hydro plant. That was when we were doing tallest plant.