Sorry to disagree with Bob and George, but I actually find DCS easier to use than TMCC, but then pretty much all I want out of a command control system (including DCC) is forwards, backwards, stop, toot and ding (if sound equipped.) I seldom play with any of the extra features.
Also, I don't think MTH will be "flooding the market" anymore than Lionel is. We're not gonna see two mega-S catalogs a year out of either company for quite a while, if ever.
As far as quality, neither company has been "trouble free." Just look at the threads on the 3-rail side or the Challenger and U33C threads here.
But, what I can say is for the past 20 some odd years I've had zero problems with AM and only one bad motor from the former SHS.
Rusty