It depends what you want from the car, if you happy with 200-220 Bhp potential then the 1.9PD Tdi 130 Bhp AVF code is arguably better: much more modern, reliable, frugal- very good allrounder !
If you want a bit more refinement then go for the v6 tdi: massive power potential with bolt on mods: nozzles, remap and a turbo will get you beyond 300 Bhp with a sound to dye for, however it has it's quirks especially if you don't get a good one ! I had them all and there's no comparison between the 2- i can put up with a little less Mpg just for the sound the v6 makes !