Firstly its virtual currency. So it can be saved for longer. I mean you will not immediately use it unless u convert it in your currencies. Secondly no tax problems. No government interference. If you want to make transactions of big ammount it's easy to do it by bitcoins. No one can stole it from you. You can invest online and can earn lot of money. I would say its safer than money.
yeah , no Doubt that bitcoin is better than cash . Here cash has many better option to handle your money perfectly According to your needs , but in actual the bitcoin has some disadvantages or we may say some limitations .
Sometimes we may face the problem of the confirmation ( that irritate much sometimes ) and second thing is that it has no full legalise to use in few countries ( since use in that country is also not a illegal thing ) .
So here in the future bitcoin will replace the fiat/cash , Because it needed some improvement at some points and also basic support by the every country governments .