Interesting as taste could only be distinguished by the same person eating some of both chickens and then of exactly the same part. aside from that, one would have to cook them both separately and in exactly the same way. Adding to that it would probably be difficult to do it in a totally scientific way - too hard basket.
So what remains is "opinion" which, although a market driver, is a very emotional and culturally dependent concept.
All this leads me to say that if you think organic tastes better it probably does - to your taste buds.
But which one do you put into your mouth first? And will that influence the responsiveness of your sense of taste? Opinion definitely rests on personal preferences as well as exposure to other people's opinions, peer pressure, research, viewpoint etc...
randonly speaking I think organic chicken is better for reasons as it seems production is more close to a natural sort of growth process and therefore could claim a less severe impact on the environment - which all in all makes me feel better. Of course there is the price issue...
In closing I think NO chicken is best based on T.Colin Campbell's research findings, published in an easy to read format in his bestseller "the china Study" where he provides substantial material supporting plant-based nutrition as the one which heals human degenerative disease states rather than promotes them as animal-based foods do.
In any case, enjoy your chicken while you can :) I personally prefer (based on my personal opinion, observation and research supported and inspired by the research and opinions of heavy hitting scientists) to eat plants myself rather than feed them to animals and then having to eat the animals. Feeding them for human consumption really is a total waste of (global) energy resources and agricultural space.
Cheers Vincent, great topic :)
Written in August 2009