Rational?
Here, let me give you an example.
I go shopping with my girlfriend last weekend, and see a pair of trainers I like.
I ask the shop assistant if they have them in stock in my size. They do.
I try them on, they look good, and I buy them. I am happy with my purchase.
------------------------------
Sophie goes into Jane Norman and sees a skirt she likes.
She tries it on.......... twice, with two different tops, and decides on the purchase.
She takes it home, tires it on again, and then says: "What do you think? I'm not sure I like it"
Now you tell me which one of the two of us is more rational - generally speaking of course