Well I would say that this Diwali, if you want to see colors, laugh, enjoy, then see OSO. It has got almost everything: Laughter, suspense(subtle), action, romance and some over acting also... but the over acting is deliberate. They knew that they were doing overacting (like the Maa beta scene at the starting).
Overall, it is better than Saawariya. Saawariya is like a poen. So, it gets boring after some time. It's very subtle and not what you call, enjoyment.
So, my preference is OSO. It's exactly as I expected it to be.