Pieapple Express was originally a Skunk crossed with a Hawaiian Sativa.
Original Skunk was two thirds Sativa, so a true Pineapple Express would be about 80% Sativa.
However, there are many breeders who have created their own version of this strain, with some claiming it is Indica dominant (Zambeza Seeds, G13 Labs for example) and others saying it is a 50/50 hybrid (Fast Buds,Barneys Farm).
Therefore, your version could be any one of these genotypes.