Both have pretty much same power when driving, Both have a bit of turbo lag.
200tdi is all mechanical and a bit rattly, It has a huge waterpump which can only be a good thing. Quite noisy and its not a nice noise,Does like blowing black smoke under load or when pushing too hard,Some do leak oil from breather which if anything just makes the engine dirty. I also reckon the Alternator belts are hopeless. (Theres a tiny belt just for the Alternator)
300tdi has a stupid EGR valve that is best removed,It uses the temprature of the water to make it circulate with a small pump to help it along,Turbo is mounted in a different place and you just cant get at it to repair and I think is slightly bigger,The Brake servo pump does leak oil quite badly on some, I know mine did. Theres also a lot of extra wiring for the fuel pump,Turbo ect. to Lower the emissions. Generally Has a host of extra gizmos that I think spoilt it.
On the plus side, Very smooth,quiet,Cleanish exhaust,Quite responsive. Has a serpentine belt for the alternator and pumps.
'stupid alternator' 'stupid belt'
Where did I say that?
Must have the knack if you can drive home with no alternator? Battery will go flat,You will have no lights and finally Landrover will stop dead if its not getting 12v to Pump Solenoid.
Serpantine belts dont break, Mine was still good after 160k,outlived 3 Timing belts.
And anyway any real Landrover enthusiast would keep a spare belt behind the seat