All other things being equal (horsepower & torque ratings), longevity and legacy should enter into a discussion about these diesel engines. I'll go for the manufacturer whose primary business is designing and building diesel engines over a truck manufacturer whose sideline business is manufacturing small diesel engines. One might find it interesting that one of the primary suppliers of diesel engines for International's Class 7 & 8 trucks is Cummins.

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'82 300D Turbo 204K
'10 Toyota Prius 85K
'13 AMG C63 (P30) 23K
'14 Audi Q5 TDI 46K
'16 RAM 2500 CTD 12K

'10 VW Jetta TDI 65K (traded)
'12 Nissan Leaf 34K (returned end of lease)
'15 Audi A6 TDI 25K (traded)
'95 E320 166K (traded)
'93 300D 2.5 Turbo 168K (sold)