I have owned AS 150 last month.Feeling satisfied with it.No issues up to now city mileage is 40KMPL on average.
Even I have rode Gixxer, I found one difference is pickup and engine power is little bit higher in Gixxer.
But the minus point in gixxer is it will look odd for the tall guys. As 150 is little bit height than Gixxer. Any how final choice is upto you, both the bikes are good.Sport Pulsar series of bike in latest 150cc air cooled engine is capable of producing 17 Ps of power. The bike is featured with projector mounted half fairing.