I agree with what some other have said above; Coconut Grove seems to have the strongest scent.
I also have a Pretty Pop, two Party Cakes, a Strawberry Surprise, a Citrus Sweetheart and Paradise Island. Thistle Whistle has passed through my hands a couple of times. All were bought used and Citrus Sweetheart was the only one who had no scent left; Paradise Island had the strongest scent after Coconut Grove.
Maybe it's something to do with whatever they use for that coconut scent?