Dtube takes a % of steem power, I think 20/25%. They do upvote good content with that steem power when they can tho. You can see many of my videos have been upvaoted by dtube. This can be a pretty big upvote too, bigger than any bot.

Direct Steemit post are all yours, no Dtube tax. In return you don’t have access to dtube tag or the chance to get a pretty big upvote from dtube. I guess you need to weigh out what’s best for you and your work, what’s getting you traction.