Transfer of property

Hi I have a property which i am living in from last 8 years which is on joint name of my mother & father. House loan was on my mother name but i have payed the full amount including the interest. Now i would like to get my house transfer on my name however my father is saying that they will write a WILL with that house on my name, I would like to know my options as like what's better getting house registeration transfered under my name or them putting the house under my name, Or Get a gift deed & later get the house transfer/registeration on my name how much i would end up paying for the prorperty. What option is better for me . . I would like to know what would my father have to pay for getting the Gift deed prepared & later i have to get the house transferred under my name . Or simply ask them to transfer the property under my name would be best bet ?