This depends on the individual qualities one is looking for in the best baby carrier This goes along with anything you purchase.  You must decide which features are most important to you as a parent and then decide which one is best for them. Some prefer the slings for the snugness they provide for the little one, but others may not want to struggle with learning how to fix the carrier to the body properly.  The ready to wear models all have different features to suit every parenting style and need.