When it comes to making cowboy coffee, the types and roasts of coffee beans you use can significantly impact the final flavor. Generally, darker roasts tend to work better for this method of brewing, as they hold up well against the high heat and long steeping time required. However, if you prefer a lighter roast or enjoy more subtle flavors in your coffee, there's no harm in experimenting with different varieties until you find one that suits your tastes. Ultimately, the key to great cowboy coffee is using good quality beans and taking care with your brewing process - so don't be afraid to experiment until you find the perfect combination!