Difference - the perforated allows a limited amount of air to escape otherwise sealed areas. Prodex total is an unbroken foil face making it a vapor-barrier that can both trap water left by intrusion or produce moisture itself via condensation from temperature differences. When vapor barriers are put into houses/sheds/etc. they are meant to face the 'conditioned' living space, the heated/cooled spaces, to reduce the possibility of condensation across temperature gradients so they produce a perforated 'wrap' that goes over top of the existing structure and breathes to help protect against wood rot or steel structures rusting.
Ah, so... since the aluminum shell is a nearly perfect vapor barrier and we toll tirelessly to keep them leak free
the enemy would be from within, humidity from cooking, bathing and respiration finding its way deep in the walls and condensing out with temperature changes - so we don't want perforated...