Just an opinion, but you have similar chances for service longevity with either a rebuild engine from one of these two vendors or a stock used engine from a rusted out 240D. The reason I say this is because the factory in Germany has the tools and experience to make the parts right, put the parts together right, and this is further demonstrated by the mileage on the used car.

You can get a junker 240D for under $500 and chances are good the engine is still very good. Then you've got various spare parts to boot.

The used engines are just too readily and cheaply available to make a vendor rebuild economical.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles