Truth be told, as long as you don't abuse either engine with too many cars to pull, both should last you just as well. LGB moguls eat their idler gears too, I have spares for mine. I have also owned a newer generation base model Bug Mauler (basic plastic rods) and enjoyed it, though admittedly it was cheaper and weaker versus my 1985 LGB mogul...if I had a choice between a big hauler on Ebay for around $100 or the LGB around $100, I would always take the LGB.
No front truck problems, No derailing issues. Sound has bell, whistle, and chuff (not great but neither was the Bachmann). And will pull more cars for years.
Also LGB had 2 gear driven axles, not just one.
Ok, flames are coming.......