I like trains because they are fun
The portal system I built is for practical over fun. I think both could be fine. My understanding was part of the idea of the train was to connect to points(hubs?) outside the city which the map room doesn't do.
Playing: Minecraft, FFXIV, World of Tanks, EvE
Retired from many, incl: WoW: Aesha, Kael'thas; FFXI: Ehlynia, Pandy; Tera: Ehlynia, PvE.