needs renovation

My father in law come to our house.He noticed that our house need renovation.He suggests to repaint the wall because the color already fade and to complete the renovation plan we must also have to changed our electrical wirings.The switches covers are already old and had a little crack and needs replacement too.But still confuse which is the best either the plastic switch plate covers or metal switch plate cover but i prefer plastic because it is cheap and has many designs to choose.