... and we left out Bluetooth control of Lionchief and Legacy locos from the above descriptions.
I would recommend the O.P. search for MTH DCS and Lionel Legacy introduction videos on the web, and browse the references found in the control system sections of this forum.
The locos he mentions will work on conventional control that's the best configuration to start. With the exception of DCC which uses DC current, all of the systems mentioned operate on AC current and can be used on the same layout. Legacy and DCS can be added to support whatever locos the O.P. acquires.