If anything "mystical" registers a fault in the Td5 ECU then you will (in the worst case where it won't clear at ignition on) need Testbook, Rovacom or similar on a computer to diagnose it. No such problem with the Tdi. Also much more electrics to potentially drown on the Td5. On the downside the Tdi is rather sluggish in comparison to a Td5. If you're going to travel in remote areas I'd go the Tdi.
Or you can do what I've done and get one of each
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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