I own two German Ballys
Fireball and 4MilBC
and I am happy mine are the german models
as opposed to english.
But to the question of resale value, it is probably a push.

Hard to say what the quantity produced is,
but generally believed that the total production run numbers
listed in ipdb.org
relate to total production regardless of domestic or export.

ipdb has added some new info on production runs for Williams E/M games (from the Kordek archives)
where it is showing that about half of most MultiPlayer models produced went overseas.