Besides the issues that Tim talks about, I think it a matter of personal choice. If you are in a hunting situation, you want the case to clear the chamber pronto, so you can insert another cartridge for a second shot when a griz is bearing down on you. It would be handy if you have heavy gloves on for a follow up shot on a wounded critter, or a shot at a second critter, say a coyote, even with out gloves. Of course in these situations, you could give a rats behind about saving cases for reloading. On the other hand if you are a varmint hunter or a paper puncher, and want to save all your brass, extractors are nice.
Good Luck and Good Shooting