IMO, the choice lies in your prototype. If your setting is European than close tied Peco is the natural. If Western US prototype then ME would be most in favor if appearance is important.
For 0n30 buy your track made on the continent of your model trains.
As far as code goes, 83 would look best. However, being the average half blind club fisted code 148 0 scaler I used code 100 ME.
There was a reason I left HO! Too small is just too small.
Kinda funny comment I got from my wife awhile ago. We got married when I was in #1 scale and 1 1/2" scale then I switched to 0w5 nineteen years ago. When she saw her first HO model train she asked "What is that?" When I explained it she responded with "Why even bother?"
Not sure of what her response will be with N or Z. tt
