Defaults should be based on regional settings in Windows, a few examples:
A) Adobe PDF printer Page Size: Letter vs A4
B) Acrobat Preferences > Measuring (3D) > Use default display unit: Inches vs Meters
C) Acrobat Preferences > Measuring (Geo) > Use default distance unit: Miles vs Kilometers
D) Acrobat Preferences > Measuring (Geo) > Use default area unit: Square Miles vs Square Kilometers
E) Acrobat Preferences > Spelling > Dictionaries for Spell Check
F) Acrobat Preferences > Units & Guides > Page & Ruler Units: Inches vs Millimeters