Answer:
The red parachute
Step-by-step explanation:
In order to compare the answers you would need a common time. You could find a number both 6 and 4 factor into, but I decided to take it to one second.
I divided 10 by 4, which is 2.5. Then I took 12 and divided it by 6, which is 2. 2.5 seconds is a longer time than 2 seconds. So the red paachute has a slower decent.