Which is the best bike YAMAHA FZ-S or YAMAHA FAZER?

I would like to buy a new bike. I am at last left with two options. one is yamaha fz-s and the other is yamaha fazer.I tried distinguishing the both bikes but could not find any difference b/w them except fairing in fazer.I came to know that fazer gives less mileage compared to fz-s because of its fairing. Does it produce much difference in mileage? And also i need the reviews(Advantages/Disadvantages) from the people using either of these bikes.im confused . Help me out.