Welcome to the android club Raja.
Nice professional review, basically that's what one has to check when buying the phone, not those nitty bitty things and numbers. Definitely good choice considering the Nexus line as there is not garbage from the OEM provider and dont wan to wait for courtesy of OEM for updates. Probably my next phone would be Nexus.
Regarding the smoothness you mentioned in comparison to apple products, yes you are right and you will be right for long long time, I dont think any time soon android is going to beat apple in that section. But android has lots and lots advantages for the power users.
As time goes you will understand the capabilities and shortcomings better as you are having all flavors of the OS offered now. Keep updating your view on all the 3 devices in comparison and surely that will reduce the confusion of most people while deciding a new buy.
Thanks for the wonderful review, BTW you have hired a professional model to showcase your phone