With this past post-season and off-season I think the perception of KG and Ray may change. If KG finishes out his new contract, he will have played 8 years in Boston vs. the 12 in Minnesota. Given the much greater success he has already had in Boston, I think that he might be known more as a Celtic 25 years from now around the country than as a Timberwolf.
Allen on the other hand, by going to Miami, especially if he finishes all 3 years there, has clouded his legacy a great deal. He might be one of the few players in history that is thought of like a vagabond i.e. a great player, but one who could never find a home.