I know nothing about Aerocat either but can comment on Ridley. These are awesome machines and ride extremely well. What I found is that they size very big. I ride a M (53cm) Bianchi coming from a M (compact) Litespeed and a 54cm standard Bottechia. On the Ridley, I was an XS (could have made a small work if I had to but it wasnt right). Ill also comment that I didn't find that the Ridley handled as aggressively as other comparable bikes but was a very comfortable ride. For a crit/circuit race bike, the Ridley would not be my first choice. For a road race or any other type of ride, I think it would be fantastic if you can get the fit right.