Smart Shower STEM Challenge

As occupants of this planet, we are running out of the freshwater that is necessary to sustain all living things. Fresh water is a finite resource that is becoming increasingly scarce. While water is constantly recycled through the Earth's water cycle, we are using up our planet's fresh water faster than it can be replenished.  As humans, we use more water than any species on the planet.  If we expect to survive and thrive, we must decrease our daily use of water dramatically.

One of the places where we waste the most water is at home in the shower. Showering accounts for almost 17 percent of our daily indoor water use. If we could make our showers more efficient then this would be one important step towards reducing our water consumption.  In terms of design, older showerheads tend to have fewer but larger holes through which the water flows.  In contrast, newer showers tend to have a greater number of smaller holes.  The question to answer in this challenge is:

The question to answer in this STEM challenge is:
Which type of showerhead uses less water and is more energy efficient?