The Eva strap is longer and has two clasps. The strap the favorite comes with is slightly shorter, has a clasp on one end, and a 'loop through' on the other end with attaches to the favorites hardware. Personal preference really as to whether one chooses to use the Eva strap as opposed to the strap it comes with. Unless you have the Eva, the Eva strap will be an extra cost.I have the Eva and I hardly use the strap. I am also planning to get the Favorite sometime next week. Is it better with the Eva strap than what it came with? thanks