Hey, @tobixen.
I use Steempeak now for creating posts, but so far, not much else. For the rest, I'm back to Steemit. The reason for creating posts there is threefold: drafts (which is also available on busy), scheduling (which you can't do in either Steemit or Busy), and the ability to see what you're writing and its preview side by side (as opposed to Steemit, which allows you to scroll under the draft window, or Busy, which forces you to scroll down through the preview).
I actually like the ability in Steempeak to see more block shaped versions of posts, because you can see more of them without needing to scroll down. That feature is available not only for your feed, but your blog page as well.
The reason why I'm using Steemit still for basically everything else is I'm not crazy about the fonts that are used (personal preference, obviously), and in the case of replying, Steempeak doesn't yet have info like who wrote the posts at the bottom of the post, or the time. Again, a matter of preference.
I also like using the Steemit wallet page over Steempeak.
I have tried to use eSTEEM, but it wasn't quite working the last time I attempted it.