Guys, I am an American flyer runner/collector today but about 25 years ago I had a large Ho layout comprised of Athern, Atlas, and Kato locomotives. It seemed to me they all ran well with Atlas and Kato engines my favorites. Those weren't cheap then. The detail was fine with me. I had 100+ Blue box cars and 54 Atlas cars as well running on nickel track. I never got into the DCC stuff. Always relied on good quality MRC transformers. My point? All this modern stuff is nice and fine but it isn't a requirement.
I have always collected American Flyer but at the time I didn't have adequate space so it was HO or nothing.
I still have every bit of my HO trains, track, Peco switches, buildings, etc stored away. I finally bought the right house with space to build an American Flyer large layout and run my first love of trains, American Flyer. The lessons learned about detailing that HO layout have helped me create my American Flyer layout.
It's all good and as I said the other night over on the S gauge forum, "trains is trains".