I have Michelin Defender in my 2005 EXL. It is a great set of tires (quiet and nice driving) but it would not last long. I do not know the difference between the two. Costco and/or Sam's always get their own name code from Michelin, I guess. I got mine ("Defender") on August 2015 purchased from Sears but they are already worn out (4/32" front and 3/32" rear) and I am ready to get another set of tires soon after only 36000 miles on it. Before 2015 I had the same Michelin Defender, which did not last long either with less than 40k miles. My Michelin experience may be consistent with others if you can check in this forum.I'm looking at a set of Michelin Defenders for my 2006 Ody EXL. The Defender and Defender XT from Costco have a different tread pattern. Is one better than the other or does it really matter.