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STEEM Dollar is a debt backed with STEEM. The digital currency is STEEM.

I see no reason not to vote for both.

I guess, if they will add integration with STEEM, they will realize, that they can really easily turn on support for SBD :)

Speaking about SBD... I just found very interesting words said by @ned, about SteemDollars:

[2016-10-15] Ned Scott Seminar at Oslo Steemit Hackathon: "(...) one of my favorite ideas going into this project, was the idea that we are going to create this pegged instrument - the SteemDollar", interesting especially in relation to words quoted in post of @krnel - Ned on SBD: "Does the community want to continue to be paid out in Steem Dollars?",

Yes, it is interesting to see evolving views as the project unfolds :)