Why not do both?
Whether you save or invest your money really depends on the financial objectives you are trying to accomplish. Saving, usually refers to putting money away where it can be accessed quickly and easily for an impending purchase. On the other hand, investing should tie up your money for a length of time, but it will also produce better returns.
TIAA-CREF’s video below breaks down the difference between the two. After watching, decide what financial goals you are trying to achieve in both the short term and long term.
Budget Smart, Invest Wise