I am very familiar with Fiddler but haven't used cURL and was wondering if anyone can point to a specific advantage to using cURL over fiddler to test web requests.
CURL and Fiddler are quite different. cURL is purely a command line tool, and it runs on Mac and Linux as well as Windows.
Fiddler is a GUI-based tool that can be automated and debug traffic from Mac/Linux only when it's running on Windows and those clients are pointed at Fiddler.