Well when it comes to traffic DP defiantly wins and also many people like DP better but I personally prefer SP.
As already mentioned, their coding forums are in a different class from those in DP. So at least 2 things they do much better than DP.
Sitepoint and DigitalPoint have their own standing points. They both are "THE BEST" Webmaster/SEO forums in the world.
We can say DP is a Knowledge Database and Sitepoint is good for selling sites (as everybody above me said )
You may want to re-read the posts then. Sitepoint's knowledge database on website coding is much better than that of DP. Also, to say DP is a Knowledge Database is a misnomer. There is a lot of garbage that one could never refer to as knowledge in any form. Still, get your point.
I also find sitepoint confusing, I think this site is better. the forums are more active and much more people selling services ect.
I'm always in DP, I go to sitepoint only when I want to check what sites are selling there .... sitepoint/marketplace
Sitepoint has richer members and richer buyers, DP is the working mans site You'll get more bargains on DP than you will on sitepoint