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The relationships between SP, Steem and SBD is very complex. SBD is more stable than Steem. SP is a better bet if you are bullish on Steemit as a platform. I feel like I am now making things more confusing for you and I don't mean to!

@eeks, a bit off-topic, but could you please tell me: is it profitable to buy a relatively significant amount of SP and then aggressively upvote yourself? No offense please, I'm just curious :)

No, I think I got it. If Steemit fails, SBD fails too. If Steemit succeeds, SBD is going to be near flat, but Steem will rise. SP will rise even more since it is basically ever growing Steem with additional perks of powerful voting.