Really it depends on what you are trying to do. If you are getting a list of previously known urls (or a single resource), then LWP is probably better. However, if you are going to be browsing a site, looking at different pages to find things, filling out forms to get information or other more complicated things, then WWW::Mechanize is probably a better choice. Really, whichever makes it easier to accomplish what you are trying to do is probably the best choice.