I have ridden aviator and Activa (new models).
Want to put my feedback (completely personal).
the Engine response and pickup - Both Activa and aviator are similar. less noise. But nothing near to old Kinetic DX 2 stroke.
Vehicle handling: Activa is best. proper weight, steability, leg room, seat position, all.. Kinetic is bit light weight, but similarly spacious.
Aviator is really bad. totally cramped. I guess that's y they tried to make more visual appealing..(though activa win easily if you look properly)
Road grip: activa and aviator both skids if you are bit careless. So take care.
Combi break is a great idea. But need to adjust properly. Otherwise deadly. Better use both levers and use your skill to break rather than trusting the combi.
Activa back suspension is very very hard... will hit your spine.
Front suspension is okey until you hit a hump in every sharp angle. IT will make a screeching sound.
I felt Aviator back side is a bit smoother.
Reg the mileage, with Activa I get 55 to 57 in city normal riding.
No data available for aviator.