Fighting purrs are much louder and aggressive. They work best in tandem. I use Knight and Hale Fighting Purrs box calls, they come in a set of 2. Use them to simulate 2 hens fighting. This works great when a gobbler has a couple of hens with him. He will usually come over to check out the fight he thinks is going on. Be ready, if you hear a gobble when you are calling, you can bet he is coming.