I have owned both fixtures at the same time and I also own a par meter and a power meter. IMO Radion is a far superior light in every way possible except the AI par is a wee bit better. The AI has been around for a couple years and is old school in comparison to the Radion. You will need almost 2 AI fixtures to 1 Radion fixture so Radion is a better buy. The new AI Vega fixture might compare with the Radion when its released but not current AI model. Before you buy do your research and you will find out what the better fixture is. If someone tells you the AI is a better fixture tell them to put down the crack pipe!
