Its better to invest than saving because if you invest your money their is a big possibility that your money will grow faster rather than saving that it will only grow a little but in investing youll need to be more knowledgeable in investing so that you wont lost your money.
That is the reason behind many people who are investing every time. Whenever you get money from any source, there is a wish for every person to grow this money. No one wants the same money after 5 years lets say. So investing make your money growing with better speed as you have said it so true. Saving is better too for any unopposed situation but invest more.