Steem is expected to rise higher than Steem Dollars, at least that is what the whitepaper laid out in the beginning. SBD is supposed to be pegged to the USD. However once it made its way onto several exchanges there is no keeping it from fluctuating. Traders who don't even use the Steem platfroms buy SBD up and send the price through the roof quite often. As of now, SBD seems to be staying right around the same as Steem. There is no telling what will happen in the future to be honest. It could push to radical heights like it has in the past (around $15), or it could stabilize back to $1 like it was meant to exist.

My own know-how and what I've learned here since joing tells me that I should convert all SBD to Steem and power it up; if I plan to commit to Steem for the long-run. That is a lot more secure than just hoping SBD continues to rise, although it is designed to remain stable. Steem itself on the other hand has near infinite potential growth.