Invest is the right thing to do, because if you invest your BTC it is high possibility to earn income. However, saving bitcoin had no effect you can only wait the fluctuation of BTC in the market, you cannot predict if the value of BTC were getting UP or DOWN.
yeah right investment can bring big chances to grow your bitcoin its just needed to have good study where to place and choose the right one,
the more you gain success the more profits you gain unlike saving it will take long time before you feel the growth of your btc.
although saving is good but if a person want to make some profit then investment in bitcoin or alt coins is the best option, because there are still some good potential alt coin which can really give you good profit, you just need to study and find the potentially good alt coins.