That would be steem, no questions ask.
The reason is I truly believe that in Steemit, you really have no way of losing except if Steemit will shut down permanently.
For the exchange rate right now, $10,000 would result in more than 10,000 steem, I would love to have that. Then convert it to SP which would boost my voting power and earnings significantly.
If steemit would stay the same rate the next 5 years, I've got nothing to lose because I won't stop posting for the next 5 years so my Steem would definitely be more than 10,000 after 5 years in which I've gained.
If Steem's rate will go up, I can continue posting for more earnings or I can power down, withdraw the money which I've earned and gained, then save the money and buy Steem again when the value goes down giving me more Steem or SP.