Have you used both? For competitive research and backlinks evaluation, which one would you choose? opensiteexplorer.org or ahrefs.com - which one? Ahrefs seems to have a much larger database, and costs less. Any reasons why you would recommend one over another? Alternatives to look at?
Why? How can this answer help anyone? I have only used OpenSiteExplorer. I like it. I appreciate the Authority score. I find websites that have so called PageRank (toolbar, of course) but far less authority in OSE. That tells me their trust factor is lower, probably, and I shy away from a site without good standing in OSE. In fact, it makes me not trust the toolbar PR I see. That *can* be manipulated. I will have to try the other 'good enough' one.
A perfect example of What's Wrong With DP. This says just as little as the post I chided just above. Clearly, Richard is just here for a sig link ... a perfect example of spamming the forum, and of "Black Hat SEO." I actually started hanging out here recently with a small hope that I might find higher quality than at my usual haunts. Oh, well.
I use majesticseo.com for free you can have acces to 1 full report, and it have no daily report limit, and it show me more backlinks than ahrefs.com.
I've heard many good reviews about majesticseo, so give it a try and let us know with your experience.