Theoretically, yes more torque.
However, advertised motor ratings are often not very realistic. Typically, weight and motor size can be used for comparison. Motor quality matters to some extent as well. I am not sure what motors you are looking to compare, but I wouldn't expect two motors of the same size and weight to have different power outputs. That being said, you probably need to go to a larger motor or lower KV to increase your torque.
You can calculate the length of the bite your bot will get by knowing the closing speed between the two bots and the RPM of the weapon. As closing speed goes up, bite goes up. As rpm goes up, bite goes down. I'd shoot for ~10k rpm for an ant.
More aggressive (positive rake) and harder teeth will also bite better than flat or negative rake and softer materials.