I've heard hundreds of subwoofers that provide zero chest thumping bass,...ever heard a Bose do it? UH......NO
You might want to study up on that a little more, as horn loaded enclosures will always outperform ported enclosures. Higher efficiency= amplitude, which gives you the dynamics.....dynamic slam is usually never measured as people only refer back to Maximum SPL reached at a specific frequency. Horn loading takes you up to the next level, just as a ported box does over a sealed design.