I think that there is a place for both. I might buy a PW 726. I have several postwar engines, and several LC+ engines, and run them all.
I tend to park or run all of one type in a session- although I have run conventional and LC+ together, running the LC+ (using handheld control) and it seems to work OK except no smoke. I set the PW engines at about 10V, and control the LC+ to not run into them or vice-versa. The LC+ seem to be getting enough voltage. It keeps me busy though!!
Of course you can run all of them conventionally. switching the LC+ to conventional control. The LC+ actually run nice, with the electronic E-unit.