I'm gonna stay out of the Trol or Terrano debate as I'm obviously gonna be biased
With regard to engines, don't discount the 3.0 because of the timing chain - the 3.0 is a hybrid timing gear/chain and all the chain drives is the camshaft. As a result it's understressed and shouldn't need replaced according to the Aussie's (same engine used in the Trols and the Aussie's know about Trols).
Early 3.0s had a bad rep but were sorted by the time they were used in the Terrano.
Only real downside is they won't run veg oil.