Athearn and Mantua. Built like tanks. Long running. Parts available.
Having been in the hobby for over 70 years (having started with an American Flyer train set at about 8 years of age, switching to HO scale as a teen), and having more Atherarn Blue Box diesels and Mantua steam locomotives, some of which have been converted to DCC, but most still DC), I would certainly agree with you.
But for someone brand new to the hobby, I would say those choices are getting ahead of the game. The first thing the new modeller must decide is why are they getting into it in the first place? Are they looking for a new hobby, and introduced to it from what they have read about it, some friends? Do they have youngsters that they are trying to bond with in the hobby, even if the young ones are still quite little. Is the newcomer interested in just seeing trains run, or getting into operations or at least some switching? How much room is available for something besides around the Christmas tree? How much money is available to start? (I can't afford drugs, alcohol or wild, wild women...I'm a model railroader!)
Is there a particular era that interests the modeller? Is there some event or experience of a relative that is interesting? (In my case, I model the '40's and 50's, because as a child, I rode the original Pioneer and Mark Twain Zephyrs, and later the C&NW 400's. If they could make me younger, the Museum of Science & Industry in Chicago could use me as a model or docent on the Pioneer Zephyr down in the basement!)
If the modern era is what they have been exposed to, then the modern diesel models will be of more interest.
I certainly agree that the newby should get in touch with a club or clubs if there are any nearby. And, above all, the new model rail should NEVER be afraid to ask questions, general and specific!
Best wishes and "Green board all the way!"