The prediction that the WalletInvestor site gave is very bad. They are forecasting a drop to the zero within a year :
https://walletinvestor.com/forecast/metal-predictionSTEEM, on the other hand, has great potential to bring you profit in a long term. Transaction speeds of 3 seconds and 0 fees are attempting and I think that the opportunity to invest into this coin must not be thrown away while it is still low in price(around 4 USD right now).
Whatever you choose I hope that you will choose smartly. Good luck with your profit gains!