I've managed to hear them both and reviewed them on Amazon.co.uk If I had to choose I'd go for the Dutton because of Roscoe and Yates' slightly greater level of emotional commitment but there's very little to choose between them. My reviews are here. I'd be interested to hear your comments:
http://www.amazon.co.uk/Charles-Marie-Widor-Concertos-Fantaisie-orchestre/dp/B005SD4TJM/ref=cm_cr-mr-title
http://www.amazon.co.uk/Widor-Romantic-Concerto-Hyperion-CDA67817/dp/B005OCESHU/ref=cm_cr-mr-title