In Wc2 (base game) you must start first Orcs campaign, isnt it?

Windows\MAC version from Bne is way better than DOS. That all. Only missed - .cda music (for MacOS or soft media player in random order for Win).
But ofc better if GOG provide different versions, like they did for some Might & Magic. At least Tides of Darkness original CD image.

Console version better cause not have taht "somewhat edition" name (but The Dark Saga). Still if you want play Tides of Darkness - play Tides of Darkness. Even if GOG not have it, you know where it can be found.