Long-term can make the choice simple if you are a believer the platform, coin and/or token will thrive. I'm all about the power-up at this point, for better or worse. Stakeholder interests, advancing technologies and integrating value throughout platforms is the game changing paradigm shift. Going all-in with intelligent review of the underlying system itself is crucial to the mass adoption of these offerings.
I like where your heart is at. I became a believer the moment I learned about Steemit. If SBD is greater than STEEM, then opting to receive rewards 50/50 will allow you to get rewarded in SBD which you can get a higher amount of STEEM by trading it. In my case, I have been taking the SBD to the exchange to trade for STEEM. This way, I get more Steem Power than if I selected "Power UP 100%". Now that SBD is worth less than STEEM, I would be taking a loss when trading for STEEM. So I choose to accept Steem Power.