Don't have a favorite brand. I buy trains that I like no matter who manufactured it.
That's me as well. My layout can handle TMCC/Legacy, DCS, and LionChief Plus, and of course, conventionally operated equipment.
So when it comes to purchasing new or old stuff, I buy what strikes my fancy. I don't care how makes it. My roster of power and cars is a hodgepodge of some scale, a ton of non scale, prototype, fantasy, what have you.
I run my Daylight Cab Forward next to my Vision Challenger, next to my Premier U30 C&NW, next to my Beeps...all in the same Yard/Roundhouse area. I have a Railking PRR S2 Turbine that currently pulls some Lionel Phantom cars on an upper level loop.
I'm into what looks good, to me, what features it has to play with, scale or not, prototypical or not, from whatever company.