A few additional considerations based on our surveys of Flippa buyers: the niche that your community is about influences valuation on par with the amount of traffic you have. This is closely followed by the level of trust you establish (readily influenced by patio11's point on salesmanship).
Given the number of qualified buyers we have on Flippa, I'd be inclined to say that our auction process may be your best mechanism for establishing ultimate price for your property.
Either way, best of luck with your sale. Do not hesitate to contact us if there is anything we can do to assist - more than happy to work with you on optimizing your auction if you do go down the Flippa path.