regarding the question you asked..its very difficult to choose one..since they are all same person- Sanaya Irani who is extremely pretty..
In IPK i think the entire set up was really good..scenes used to dazzle..each cute expressions..her cute face were captured probably with the best camera angles..and with so much clarity..
In ChhanChhan she got much better dresses to wear..much better hairstyle..but scenes are gloomy. .sanaya is so fair still..
but even that could not hide her charm..after all she is the sunshine girl..shining all the way..
So i love both the looks..infact Sanaya is getting prettier day by day...just a little bit of improvement in camera angles and lighting is needed..