I would say Arroyo has way more value than Rios.
He is cheap for the next 2 seasons and just had a fantastic season. He's worth a pennate to somebody. If we trade Arroyo right now, Krivsky needs to bring in a kings ransom of talent that could really help set up the future for the Reds. Rios doesn't do that. Getting Rios for Arroyo hurts us right now, and doesn't do a whole lot to make us a great team in the future. He may be under control for 4 years, but 3 of them are going to be pretty expensive.