I wouldn’t concern myself with labels but rather focus on the specific frame geometry you’re looking for. One mfg’s “endurance bike” could have similar geometry to another’s “gravel bike,” to within millimeters. A comfortable knowledge of what stack and reach numbers will work for you will go a long way in making meaningful comparisons. Once you’ve narrowed down the frame choices, you can eliminate candidates based on specs, gearing or tire clearance or whatever else you deem important.