Tosh the Pugs and the citreons have the HDI engine, Fiat put their own engine in, as far as iam aware.
If it were me i would go for the expert or dispatch mate, some here may say the Fiat engine is good, i dont know, all i now is the HDI engines have very good recomdations from mechanics
In that model range, including the facelift, the 1.9d (non Turbo) that Scudo use is a Peugeot engine, and the same one that is used in the Expert and Dispatch.
The Scudo 2.0l JTD in the year range was a rebadged Hdi Peugeot engine used in the Expert and Dispatch.
At that time Peugeot and Citroen (PSA) were having the van built by Fiat and using their own drive trains. So the only difference between all 3 of them is cosmetic.
The general rule of thumb was that all 815kg payload vans were 1.9d and the 900kg payload were Turbo diesels. Even in the early days before the Hdi engine, the 1.9TD was also rated as a 900kg payload.
It was only after this (with the new models after 2006) that Fiat started to introduce their own Multijet diesels into the model range. The vans are still built by Fiat so the Peugeot & Citroen models use the same engine. Fiat are using their Multijet engines now.
The red Citroen Dispatch in one of the links that Tosh likes is the Enterprise model, 1.9 straight non turbo diesel but being the Enterprise model comes with ABS brakes as standard. No all vans in that model range had ABS.
Spruce