Stick to your guns and get a bike mate. Try telling your parents that the bikes you are looking at at highly advanced machiones with great safety features and stuff. Well about your querry the R15 is a replica of the famed YAMAHA R series which is great if you re into the moto GP style riding of leaning deep into corners and looks like a GP bike.

Whereas the FZ series is awesome on city streets with ample torque and stabilty to guide to traffic gridlocks with ease. They re both winners. If you re nt not looking at riding like a speed demon all the time and need a bike with good stability go for the FZ.