Personally in pots I am not a huge fan of organic due to potential issues with uptake. A plant will only take up something the roots can pick up. Organics need to break down into something usable which is why they are unlikely to burn the roots, but also why I don't like them. Synthetics can be organic, or not, doesn't matter to me and the plant will just take the nutrients and go with it. You will never be free of chemicals unless you get extremely passionate about it.