Investing on safe investments like trading and physical bitcoins or altcoin mining in your own house or partnership with some people in some businesses that includes bitcoin.Saving would just be good if you have a stable source of income through bitcoins
Wait a second, Im not sure if I understand your post correctly, but you claim that trading is a safe investment.
In my opinion, saying something like that is very stupid, because getting money from trading is a really tough task, to be constantly profitable on a long-term.
It is a very unpredictable thing, you can never be sure that you are going to make money from such an investment, when you are pretty much guaranteed to get returns from e.g loaning service: if you do it correctly of course.
I also dont really understand why saving is good only when you have some stable source of getting bitcoins, it means that nowadays you cannot save without using cryptocurrencies? Come on, you can always do a bank placement...