Saving means easier access to spending it. But when you invest it chances of earning more out of it and holding it for some time before you can spend it
well, when you invest chance of earning more increase, but don't forget equal chance of loosing will also came along with chance of earning.
when you invest you can face either profit or lost.
but to me i think the chance of making money from investing money in bitcoin is more as compare to its lost. because the price of bitcoin is increasing from time to time as we can see that the price of bitcoin recently cross 1500 USD level that is really a very good progress. i am still hopeful that still there is too much potential in the price of bitcoin to increase more and more.