If you have racing DNA in you the rtr180 is the un-doubted choice.you will really enjoy riding it.great handling in corners.
With P180 you get big bike feel,decent engine but not as aggressive as RTR.
Good for long tours than RTR but for trips under 400 kms I thing RTR will be equally comfortable.Pulsar 180 scores decently in all but extraordinary in none.
So just test these bikes once,and I tell you if you are a RTR guy at heart you'll be inclined to it in 1 ride itself.Aur signal nahi mila to go for P180,which is also a great bike