It will make life easier if you can mount things to your handlebars, as it gives you more room. Also, by being able to mount things onto your handlebars, you are able to disturb your weight a lot more easily.  Not all styles of handlebars allow you to do this, so this is something you need to check. Most types of handlebars will allow you to mount onto them, yet some styles like the moustache bars may be more tricky.