Logos 6 has some really great features, like the Psalms Browser.
You can see it here: https://www.logos.com/video-tour?utm_source=logos&utm_medium=email&utm_content=5003989-psalmsexplorer&utm_campaign=promo-logospro2015(scroll down until you see blue rectangles).
Psalms can be sorted by their genre, attribution, themes, etc. What I liked the most was Structure button—one click and you can see chiastic structure of the psalm, even with subheadings.
I think Accordance starts to fall behind Logos in graphics area. Maps feel little bit outdated and there could be more visual study/research tools. (We believe when we see, like Thomas… :-))