You made the correct choice. The Pinarello is more of the pure bred of the two. Sold Bstone for 5 years at the shop, and rode an RB1 for a summer. A very good riding bike, but (there is always a but) it is not the same ride as the Pino. It is not as sharp a bike ride wise. The RB1 feels like a capable bike, the Pino feels like an Italian pure bred. Quick, but not overly quick. Solid, but not harsh. The Chorus is a delight and has much better aesthetics than the Tricolor (which I see as ugly anyway).
Enjoy your new ride!