Ford sold the Maverick (Nissan Terrano) in this period. It had a 2.7 litre 100hp diesel. So bigger displacement and way less power than a Tdi.
Not sure on anything else from Ford. They had car engines, but so did Rover.... so can't really compare them. Although the diesel Escort we had was probably one of the most depressing engines I've ever driven!
Don't know much about the LC diesels. But you can't really compare a 3.0 litre six to a 2.5 four. That would be like saying a Honda 2.0 litre VTEC is rubbish because Ford sell a 5 litre V8.
A quick Google says the 2.8 diesel (3L) was used in the Prado with 88-90hp. The 3 litre (5L) with a max of 95hp. Not sure if these engines where in the models you are thinking of, as the LC lineup is so confusing.... But either way, bigger displacement and quite a bit less power than a Tdi.
As for Mercedes, well the only 4x4 they offered in the 19j/Tdi era was the G-Wagon, which was quite a lot more money. But looking at the diesel engines offered they are hardly comparable to the 19j in terms of power and way behind a 200Tdi.
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Tdi's run forever, loads with well over 200,000 miles on them no bother at all. When new, as said they were class leading.
e.g. the 2.5Td Shogun only made 94-98bhp.