I suggest bitcoin because it's secure and fast no need to type any personal info and the transactions are totally free and if you save lots and lots of bitcoins right now you could be a millionaire after 10 years because more people are investing to this crypto currency more countries are starting to use bitcoin.
yeah I agree with you, if you're using bitcoin to invest long term, the example you hold bitcoin for the next 10 years. it will be much safer than gold and of course you will become a millionaire if you buy a lot of bitcoin.