Looking for experience comparing the Swarovski X5i 3.5-18x50 to the Swarovski Z8i 2.3-18x56. Primarily concerned about the durability of the turrets on the latter. Going on top of a McWhorter in 28 Nosler. Hoping to use the gun on a couple of backcountry/horseback hunts in the coming years. Thanks in advance for any help.