Only what I've been told, but talking to a customer of Bruce Davis and on another occasion a couple of his mechanics and they all said that Bruce and his boys reckon the TD5 probably has more potential and will take more abuse (in terms of able to handle power and torque and stay together) compared to the Tdci.
It was a very impressive design, quite ahead of it's time compared to most all other manufacturers light diesels.
That chat with Bruce's mechanics was from about three years ago so they might think differently now, but they were pushing crazy numbers out of a TD5 test mule on the dyno just to see what it'd take.

