If a facelift 204 has Comand, updating the maps is far more expensive as Star is needed for NTG4.5, whereas second hand DVD's can be used for pre-facelift NTG4. However, you get 7 digit postcode instead of 5. I may be wrong, but I think my 2008 S204 does not have a DPF, but I'm pretty sure the facelift does.
The facelift also brought the BE engines with better mpg and lower road fund than the equivalent pre-facelift.