It very much depends on how much you can negotiate off. The more you get off the price, the more you insulate against depreciation. In percentage terms, you'll get lower depreciation with the Toyota based on list price, but that's all academic if you can get a better discount on the Citroen. The latest C5 is a far superior car to the previous model and as a result it doesn't lose its value in the same way as the old one did. The two cars are covered in detail here: www.honestjohn.co.uk/carbycar/toyota/avensis-2009 and www.honestjohn.co.uk/carbycar/citroen/c5-ii-2008.