As Configuring Dispatcher says, glob property is used to match with the entire request-line while url will just match with url element. Clearly, glob is more powerful that url.
Why would you want to abuse glob with just an element of the request? Per my knowledge, the recommended property is url in this case.
Element of the Request Line: Include /method, /url, /query, or /protocol and a pattern for filtering requests according to these specific parts of the request-line part of the HTTP request. Filtering on elements of the request line (rather than on the entire request line) is the preferred filter method.
glob Property: The /glob property is used to match with the entire request-line of the HTTP request.