Q. Is it better than aprillia sr150 - Activa 5G?

Well can I ask you one question? You're kidding right!? So, No activa isn't better than sr150 firstly the difference in the capacity of both engine's are vastly different one in activa has 109cc motor and other is 154cc and activa has 8 hp and 9 Nm of Torque, Aprilia has 10 hp and 11 Nm of Torque, activa's cvt transmission is slow and sluggish for enthusiastic driving whereas Sr150's cvt transmission is agreesive, activa has softer suspension setup for comfortable ride (though i doubt it's comfortable) and sr150 has stiff suspension setup for better handling and acceleration, even though sr150 weights about 122 kg and is heavier than activa which is around 106 kg sr150 is faster in straight line speed and acceleration. And I still think you're joking

Different segments bcz 5g is 109cc & main advantage is that Activa has proven track record

Sr 150 is 150cc scooty and activa 110cc both are different segment scooty