NEVER take the 100% power-up option as long as SBD is above 1$!! You will lose money.
SBD is hard-coded to 1 USD, which means you will get SBD regardless of its USD price. Steempower however will be calculated based on the USD price.
If you'd get 4$ as Steempower and Steem is worth 8 USD - then you'll get 0.5 Steempower as in comparison you'd get 4 Steempower if Steem were worth 2 USD.
I see what you mean @therealwolf
I have found some information on this. My suggestion to take 100% option for a post is not correct but one should not be sitting with SBDs and convert to Steem as soon as possible.
https://steemit.com/steemit/@bitgeek/50-50-is-a-better-payout-option-right-now
Even taking into consideration the high inflation rate on SBD you still make more opting for the 50/50 option.