Should I Buy STEEM on Here or on Bittrex?

So, I want to buy STEEM. I love Steemit and believe that STEEM will be a huge payoff someday.

I'm also a blogger and love this platform and want to earn STEEM here just by producing content.

So, should I just by Steem Power here and use it to empower my blogging and then cash out in 10 years, or should I buy STEEM on Bittrex and hold it there?

Which option would have the best yield?

I want to make 1000% on my investment, so if STEEM is around 2.50, I would sell it when it hits 25.00 or more.

Your thoughts?