Organic vs Inorganic edit
The organic vs inorganic choice is a hot topic. You don't need a book to help you make any moral decisions so its just the facts here. The plant material that the plant grows is identical in structure and content regardless of which method you use. The plant only uses basic building blocks, taking molecules from the air and the nutrients and assembling them into the plant matter. The by product of this process is oxygen.
The real (practical) difference between organic and inorganic growing is how the raw materials are provided. An organic grower will use larger elements that will be broken down by a system of organisms living in the nutrient solution/grow medium or the soil. An inorganic grower uses nutrients that are already broken down into a form that the plant can utilize. Non-organic nutrients might contain organic components. For instance, many fertilizers intended for soil will include urea nitrogen. This nitrogen requires micro-organisms to break it down before the plant can use it. These organisms won't thrive without soil so these fertilizers may not work in hydroponic systems.
There are hydroponic mixtures that are organic and there are those which are not. Either way, you have control over what you feed your plants and can insure that no harmful pesticides or other chemicals are used in growing your own marijuana. Provided you flush your plants properly they won't contain any of the nutrient solution so the actual plant material that results should be the same.