As far as I can judge it, it is only more profitable if your videos make all their gains in the first seven days, since after 7 days you do not get any more reward for new upvotes.
And there are still much less watchers on dtube than on YouTube.
Maybe you should try to post them on both platforms. Dtube for some quick reward and YouTube for a long term passive income...
RE: Dtube - why are those "fees" so high?