I have both; earlier re-painted (GM&O) Atlas and later PS3 MTH. I prefer TMCC, so
there's that, but my DCS Remote Commander works on the MTH version.
I see no superiority in the detailing of either.
The MTH ALCo sound is noticeably better - but my Atlas RS-1 is several years old
(and has that blasted TA EOB - which I keep turned off) and the latest GM&O RS-1 is improved in the cruise and sound area, I'm sure.
Both great pieces - operating system is the only deciding factor, I would think.