Looking to purchase either a xfl 15 or a sa 15. I have 2 locally for sale and I don know which one to buy. The American bass as a 3 inch coil as the sundown has a 2.5 inch coil and the American bass has a little bit bigger of a motor. I really don't know which one to choose. It will be ran on around 1000 - 1500 daily in a 3 cube box tuned to 34. Please help me decide and don't just say which sub, please give an explanation why. Thanks.