Really hard to choose one since both of them got their own ups and downs.
I think only a very few people will die wanting for a Push Start Button for their car.
Majority of us wanna turn the key itself.
I believe about 99%(Cool, its just a random figure :p) of people feel lazy to insert the key into the slot. Am I right?
Sometimes, it seems to be very difficult to find the key slot especially when we are in hurry.
So my point is, how about an "Integrated Key" in the key slot instead of a "Push Start Button" on the dashboard.? All we wanna do is, get into the car and turn the key