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SBD is pegged to the real US-Dollar, aka not as volatile as Bitcoin.
SBD offers an interest rate.
SBD will be used by the Steemit.com community which is much more different and especially becomes bigger than the BTC community ever would.
And the Steem devs are planning great things related to SBD, I'm sure.
Bitcoin is for nerds but SBD has the potential to become the defacto online-currency for the average joe.