Although it's clear each describes their service differently, setting aside their public relations it appears to me the basic service they offer is basically th

Although it's clear each describes their service differently, setting aside their public relations it appears to me the basic service they offer is basically the same: they make it easy to setup community sites where people can post things, vote on things and accumulate karma. Whether those things are news articles, answers to questions or other things (like reviews of silly iphone applications e.g http://iphone.lockergnome.com/ http://iphone.lockergnome.com/ ) makes little difference technically. What I'd really like to know, ideally from someone who has worked with both, is if there are any particular features one or the other offers that actually do matter. Or perhaps this is an example of where developing good PR is more important than focusing on features?