Handlebars vary in their width, drop diameter and the profile/shape. Comfort depends on your size and shape of the rider as well as riding style.
Have a look at 3TTT who make a wide selection and supply dimensions.
Most drop bars are designed for racing but a few (The 3TTT Morphe and Nitto brand bars) are made for touring and feature smaller diameter drops and more complex curve profiles for better comfort when riding higher up.