Here I will try to "rate" - on a complete subjective basic - some Theme/style Plugins for Confluence 

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RefinedWiki Original Theme

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Enterprise Theme

This is a very usable pluging with a bundle of extra usable Macros available, even if the Theme is not selected on a site, making is usefull with other themes.

The plugin has some strong blogpost macros as gu-blog-posts and top-stories

The design is rather flexible and the fact that You have a wiki markup "placeholder" - Called Global Sections -  for both headers, footer, sidebars and below contant make it easy to set ind extra macros, contents and stuff, that would be relative diffecult to put in otherewise. Also, all the content placeholders can either just inherit from the global design (in the Confluence Admin section) or be maintained per site, very very flexiple.

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Also, quite som fair amount of styling is available, though the lack but customization of fontsizes are completely missing, and the font fonts set by the theme are set rather small for the theme. This , this can be fixed easily (partly) with the following code in the Global HTML (or style pr. space). But of cause, this is my subjective opinion

 /* Enterprise Theme font corrections */
.wiki-content h1 {font-size: 35px; }
.wiki-content h2 {font-size: 30px; }
.wiki-content h3 {font-size: 25px; }
.wiki-content h4 {font-size: 21px; }
.wiki-content h5 {font-size: 17px; }
.wiki-content p  {font-size: 15px; }
.wiki-content a, .wiki-content a:link, .wiki-content a:visited { color: #538011; text-decoration: underline; }
.wiki-content a:hover { color: #000000; }
.block-element-recently-updated .recently-updated-sidebar a {font-size: 15px; }

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Also, the theming and the sidebars are very flexible for admin to set design, and some very special features as "Set as landing page" versure the default "Embed page View" are very nice and gives users a good inpression on hitting a page (this is customizealbe per page):

As the name Enterprise indicates, this theme is meant for business, more that public facing or "pleasure" - so there are no integrations to social medias like facebook, twitter or similar.

Conclusion: An excellent pluging, but the small fonts and missing Style Designer gives it some heavy limitations. The developers documentation is very poor, but the plugin is relative intuitive.

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Zen Foundation

Definitily the strongest a strong pluing with one of the largest cusomizations possiblities, wich which - for my part - also makes it the one not to use, and the customizations is very timeconsuming.

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• http://hub.amplience.com  
• http://facebook-presence.com  
• http://www.mindmercatis.com  
• https://company.payjunction.com/support  
• http://stepstonetech.com  
• http://truelove.onconfluence.com  (demonstration site)
  
  

Conclusion (very subjective after a short test): Problably an excellent product, but set of a lot of time to design You be prepared to take on a time-consuming task to design Your style(s). As a private focusing on content rather than nitty gritty design, I kind of "resigned" on the plugin.

Adaptavist Themebuilder

I cant say that I have tested this (very) much; my first disappointment is that out of the box, nothing is prepared, preloaded or added - the ROOT Theme is basically just a copy of the Confluence 5 Theme.

I have not read the manual or attended the Webinar (yet), but I am somewhat disappointed. Most other theme's - and especially RedifinedWiki has a some (or a lot of colors), fonts, a new footer etc, just waiting to be enabled; this is not the situation with ThemeBuilder. I would have loved 5 to 10 skins - or just a "installed with sample skins" or a "get samples here" big red button...

Oppositite to the Enterprise Theme, ThemeBulder works with "Storage Format" - aka xhtml, and as with Zen, the whole getting in business takes quite an effort; You dont just jump into the product. It's for sure a compeditor to Zen as both products are for those who want to brand their Confluence to the Max; typically for Internet faced sites.

I like the possibility to make N number of skins and the inherit part; but I am sure it gets very complicated to maintain at some point.

Conclusion (very subjective after a short test): Problably an excellent product, but as with Zen, be prepared to take on a time-consuming task to design Your style(s). As a private focusing on content rather than nitty gritty design, I gave up on the plugin., I kind of "resigned" on the plugin.

Brikit ThemePress

To be honest, I never got it right - spent some 1/2 hour figuring it out. A minus could be that my other Theme plugins and custom CSS fucked it up a bit (should have been tested on a clean instance) - but I never got the idea in the Layout and building block pages - and I do hate plugins that twist standard Confluence things and change their behavior - suddenly the "Edit" button did it a bit different and a new menu item on the Tools apeared: Edit entire page - Followed by a warning about this was only for certain procedues as copy page etc...

The videos seems nice and the documentation appears well at first sight, but I never got it.... 

Overall conclusion

No theme can be branded as a winner, for that the Themes themes are way to different, and each coveres a part of what the need areYou may have.

Zen Foundation and Adaptavist ThemeBuilder (and perhaps Brikit Theme Press) is for sure the leading product products if You want to go all the way, whereas Enterprise Theme in general is quite "portal"/Internet aming. RefinedWiki is easiest for making a quick and nice look in overall, and with a Designer for making Your own themes, something the users of Enterprise Theme may miss after a while.