If we are mining bitcoin save the coins become good choice because old miners save the coins then price going up, but if we are mining altcoins more good exchange them to bitcoins and always hold it (bitcoin) we just sell for pay electric cost and internet.
If you have other sources of income, and the cost of mining is small part of the income, it is better to save it.
I think for now much better to save all the bitcoin from mining because time to time the bitcoin price was increasing and i think before this year end it will gives us much higher price and that time will be the right time to sell our bitcoin.