I just looked at both bows. I would go with the Z7. Both bows are very short axel to axel. Both have a very forgiving brace height at 7 and 7 3/8. With the Z7 you will shoot a lil faster. Both bows will fit your draw length. Basically you are talking a differnece in two inches in length and 3/8 difference in brace height. You are splitting hairs here between the two bows. Shoot em both and see which one you like better. Basically the same bow.