The gold coin seems to be the most secure for me to be honest. If we're looking at monetary stability I'd rather have more than 9 years. Looking at our traditional ways of exchanging money, we have a history of about 6-7000 years, so that's a little more researched I'd suggest.

Honestly looking at the BTC prices right now and in the latest months, I'm seeing a few months of stability for the future followed by either a massive crash or some kind of small increase. Not really worth or secure enough to put my money into.