i would have to look at the seller and opt for the seller offering the lower shipping cost just on principle...meaning, 9 times out of 10 those charging less for the product but "Hiding' some profit in the shipping costs seem to be trying to deceive you. That being said, I tend to be a loyal buyer, if I find a seller who is being straight forward and I can communicate with, I'll be willing to pay a little more because their making the effort.
Of course you need to make sure the variables are all the same from each seller, location, shipping method, etc...