Personally, I've sold a website on Digital Point and another using Flippa. The one on DP got a BIN offer right away and the one listed on Flippa went through a nice bidding competition before it was sold at a price that I am satisfied with.
If I were to do it again, I would list my website on Flippa first simply because it is a well known marketplace. People visit Flippa to buy and sell websites so theoretically, it is much easier to get an offer if you have a solid website with a comprehensive listing. From my experience, I find that buyers on Flippa tend to ask informed questions too. On DP, which one of my websites was sold 3 years ago, I had people asking me what is the website running on even though I've kept the "Powered by WordPress" footer.
Hope my experience above helps.