Easiest Engine To Work On?

I was talking to a diesel mechanic the other day and I asked him which of the four truck engines (Cat, Cummins, Detroit, or VED) was the easiest to work on. This, ignoring availability and cost of parts.
He said that two were the more difficult, one was so so and one one was far easier than the others. The answer surprised me. Of course he said it was only his opinion that Cat and Detroit were the more difficult, Cummins was the so so and VED was the easier. He said that his answer might be biased as he worked for a dealer and when a VED came in, it was usually assigned to him and he worked on Cummins more than the others.
I wonder if there are any mechanics out there who agree or disagree with this opinion.
I know that this will probably generate some cute remarks but I would also appreciate some honest answers.
Thanks to all.

 

Thanks for the reply.
Sorry if I didn’t make myself clear.
My question was not about the best engine but about the easiest to work on.
I have been talking to a mechanic who has never worked on a truck, but has many years working on diesel and gasoline tractors. His hobby is restoring old cars.
He has agreed to do a complete inframe overhaul of any truck I might buy, and dress up the body and interior. After, I plan to have a local Mack dealer give it a complete DOT inspection.
I want to buy the latest model I can get for the cheapest price, so I ask my question about the easiest to work on. Wanted to make the labor effort as easy as possible.
I am not interested in resale value so think I can get a later model truck with a VED than a Cat, Cummins, or Detroit at a less expensive cost. Bottom line, which engine would be easier to work on?
Thanks an insights.

 

Thanks for the objective answer.
I am looking at Volvos with VED (among others) as I feel that I can get a 2000 or 2001 at a very inexpensive cost. I have reliable information that I can readily obtain parts so there should be no problen for the mechanic who will work on it. I can't believe that companies would buy fleets of these things were they to be as bad a some apparently think they are.
Bear in mind I want to get a starter truck that will only have to last for a year or two. Then a determination will probably be made about a newer rig.

Now for my next dumb question.

I would probably have to go to an older truck ( mid to late 90's) but I think a pretty good KW T600 or something equivalent with a Cummins 430-460 HP can be had at a very good price. The reason they are so cheap seems to be they have a nine speed transmission with overdrive.
What can I expect were I to buy a truck with nine speed and OD versus a ten, thirteen, or fifteen speed? How much higher cost of operation, MPG be, if any?
Remember, I don't want this thing to last forever and resale value is of no interest to me at this time.
Thanks to all.

 

Thanks for the advice.
I seem to be taking up a lot of space asking questions, but am learning what I think is useful information.
I guess for my purpose at this time I might consider a KW, Pete, or maybe an International with a Cummins N14 with 9 speed and OD. Which ever truck will be the latest model and best condition for my dollars. There seems to be a lot of bargains available. By next week I'll probably change my mind.
Thanks again for what I consider to be great advice.