Cash is better than bitcoin because it is acceptable by everyone, easy to use and easy to transact. Bitcoin is far compare to cash, but i believe that someday btc will use a main way to transact online. Investing your cash with bitcoin today will surely help you achieve your goal in life.
Someday bitcoin will be easy to use for shopping or transactions when the technological era has come, where the whole world uses digital currency and people already understand the technology and when that era comes you must be able to use bitcoin like cash money