A green pear has slightly less antioxidants versus most types of apples, though only by a marginal amount. In fact, the ORAC of golden delicious - which is a less nutritious apple - is almost exactly the same as that of green pear.
ORAC Source
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010