I too have both Em5 as well as Em4. To be honest, there already is an enormous amount of mods for Em4. And that makes Em4 great to play; there are mods now for many countries and cities so you would be able to recognise your own neighbourhood EMS which would be nice to play.
Em5 however is slowly starting up with its own mods now. And slowly but surely they're expending as well. The graphics and gameplay however are more "nowadays". I would say, the Em5 is sure worth the try considering the fact that, although slowly, Em5 managed in picking up speed in building mods. So I expect that in due time, playing Em5 mods will be recognizable to more cities and countries as well.
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