The themes have very small cosmetic differences between them. YellowPress is marketed as a review type directory whereas WPClassifieds is a classifieds with a rating system though they are essentially the same theme, therefore which one you buy comes down to which design you like the best.
It is possible to run the themes in two modes: free or paid. In paid mode users have to make a payment via PayPal in order to submit their website to your directory. In free mode you can limit the number of entries from users to reduce spam.
The themes have a host of features including:
- Expired post renewal option (Paid mode)
- Social bookmarking
- Built in contact form
- Built in pagination
- Star rating system (with WPClassifieds)
The home page resembles a a traditional gallery/directory though the rest of the site looks like any other WordPress site so has space for advertising down the sidebar and a widget ready footer.
Directory sites such as these can make good money if you take the time to establish them through marketing. Though I would encourage you to do some research into whether a customised WordPress theme is the best solution for this kind of site instead of a dedicated stand alone script.
YellowPress retails at $32 for a single license whereas WPClassified retails for $27.
Links: YellowPress | WPClassified