I know you are excited to get a new bike. You really need to know however exactly why you prefer one bike to another BEFORE you purchase one. For instance, gearing may be different, and you need a certain ratio. A frame may have certain attachment points or features you prefer. One may not accommodate tires as wide as you prefer. One may not use your preferred drivetrain. It may come down to riding and one just somehow doesn't feel as good to you. For whatever reason, you need to know exactly why you prefer one bike over another.