The shortest way of putting questions about color/brand/make/shape, etc.

[VictorB]

Here are the questions I'm trying to put in a shorter and more colloquial way:

What is the color/brand of the cars that get the most speeding tickets?
What is the gender/age of the drivers which get the most speeding tickets?

My options are so far these (and I'm not quite sure if they are correct):

Cars of what color/brand get the most speeding tickets?
What color/brand cars get the most speeding tickets?

What brand of cars gets the most speeding tickets?
What car brand gets the most speeding tickets?

What gender drivers get the most speeding tickets?
What drivers' gender gets the most speeding tickets?

Which one from those would work best?

Also, here're the following questions I'd like to ask in somewhat a shorter and more casual/natural way:

What is the shape of the dish you serve this on?
What is the brand of oil you bake pancakes on?
What was the size of the boots you wore at the age of twelve?

Would these ones work:

What dish shape do you serve this on?
What oil brand do you bake pancakes on?
What boots size did you wear at the age of twelve?

[Easy-Breezy English]

VictorB, most of your original phrases are perfectly colloquial the way they are.
Here are some alternative versions:

What is the color/brand of the cars that get the most speeding tickets?

What brand of cars gets the most speeding tickets?

What is the gender/age of the drivers which get the most speeding tickets?

How old are the drivers who get the most speeding tickets?
Do men or women get the most speeding tickets?

What is the shape of the dish you serve this on?

What shape dish/plate do you serve this on?

What is the brand of oil you bake pancakes on?

What brand of oil do you fry pancakes with/in?

What was the size of the boots you wore at the age of twelve?

What was your shoe size when you were twelve?