This decision depends more on where the SBD is. If it is unusually high as right now (it's supposed to be worth only $1 USD), then it's best NOT to power up 100% when you publish, but get as much SBD (from 50/50 publishing) as you can and then buy Steem from those SBD's once they are paid out. You can then manually power up the Steem you bought.
This way you will get a LOT more than if you had powered up directly.
Watch the video by @danarstarlite on "everything you need to know about your wallet - he explains this brilliantly.
I resteemed it a couple of weeks ago so you can find it on my blog here.
awesome thankyou thankyou ms.connect! You are my favourite advisory :D