Bitcoin is 12 to 13 years old while MASS is hardly 2 years old then how can you say its too late to invest in mining of MASS? MASS is still in its very early days and its not that late to invest in MASS mining. There is literally no data avaible to tell that.
Bitcoin took lots of time before it gets recognition while MASS is launched in a time when everyone knows what crypto is and how much beneficial mining can be. So comparison of Bitcoin and MASS cant be done at the moment. If you have HDD going idle everyday then better invest that in mining.