Hmm that's a tough choice. On the one hand having something to sponsor contests with would be really good to have and give a huge incentive to give posts your all, on the other hand more powerful upvotes could possibly help the newcomers more in the long run. I'd say both options certainly have their own pros and cons. Maybe use just part of the earned SBD to buy Steem and power up? Given how cheap Steem is in SBD right now it might not be a good idea to pass on that opportunity, but it's all speculation based and the exchange rates might change even more drastically. I guess I don't think I can really help make a decision here, to me it's mostly unclear what the best action to take is.