Sold mine on PH at a premium price, also it was on ebay and had a number of people ready to buy if the PH buyer dropped out.
Key is to write a really good, engaging advert, use pictures that are functional not pretty (although one pretty one is useful for getting attention), be honest in the advert and outline the things that need fixing up as well as the things that are great about it and make the purchase as easy as possible i.e. make yourself available for people to view as often as possible etc.
I also found that all the people interested in my Zed on PH and ebay looked at the build thread that I had on here, gave them a lot of confidence in what they were buying.
Autotrader I have found to be utterly useless and the advertising overpriced for anything I have every tried to sell.