Note it would be better if people not say which is better, but only to compare each
Diesel9, sure get help to & ask questions, but in the end it's up to you to decide, nor am I going to say which is, or is not better.
ALL simulators (including real models), have their good & bad points. It also depends how good the item for ANY simulator/model is made, and the work/detail that is put into it.
If you have the time, go to a model show, if the model show has a simulator stand.
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Weather
I'm not sure if this issue has been fixed with MSTS1 with a version of MSTS BIN or with another download somewhere, but in MSTS1, for each activity, you only have one weather setting, where as Trainz, you can have various weather conditions, in the one session.
Driving Trains
Not sure if this has also been solved with MSTS BIN or not, but with MSTS1, you can only drive one locomotive. And if it it's a double ended loco, you can't swap cabins, although a version of MSTS BIN can allow you to swap cabins - and nope, I haven't figured out how do that yet.
In Trainz, you can move the driver to another loco, you can drive different trains in the same session. In MSTS1, at the moment, although you can have a passenger or two, you can't actually load passengers. At times, MSTS1 passenger cars look empty, even in inside shots.
Viewing Trains
In MSTS, you can quickly go from the front of the train to the back, where as in Trainz, you have to go back one carriage at a time, until you reach the end carriage, not very good if you have a very long train, unless you use CONTROL+FIND, and then you need to find the end vehicle in the list, and make sure it's the right vehicle first.
Roaming Camera views
In MSTS1, when you press "4" for what is similar to Trainz roaming camera, you get different positions. For example you can get two different roaming views at the one spot, unlike Trainz, where for each spot, you only have the view that each roaming camera shows.
Activities/Sessions
In MSTS, you can make an activity, you can test the activity & the timetable without actually running the activity. In Trainz, you can't test the activity or timetable, unless you actually play the Trainz activity. Depending on the detail the activity contains, making an activity can be hard or easy, be it MSTS or Trainz.
To Blackwatch: Just as in Trainz, MSTS can have good & bad track. A lot of default track in BOTH Trainz & MSTS looks too cartoonish, (ie: the rails look flat).
But in the end, all a simulator really is, is just a set of dots on a computer screen.