When choosing armour, take resistances over small variations in armour value. If you prefer take looks over small differences in armour value or resistances. Damage delivered is usually much more than current armour values, so small differences aren't game changing. Note that most 'found' armours totally lack Rend (monster) and Elemental resistances, so are not useful for the non-human enemies.
Equally for swords, the sum of base damage and additional damages is more significant than the base damage itself... armour piercing (on boots, armour or weapon) is worth a fair bit, most of the time, often more than the value of high critical damage bonuses.
The headline values are the most obvious ones in the UI, but following them alone is misleading.