Front firing vs down firing is more preference, aesthetics, and practicality (Do you have small kids or pets? Then maybe it’s better with down firing.). Sealed subs vs ported makes a big difference. Sealed tend to be preferred for music and ported for movies, but that’s a gross generalization. In general, sealed will give you more punch and less sustain. It will have deeper bass extension, but at a much lower volume. Ported will give you loud deep bass down to the tuning point, with lots of rumble, but minimal extension past that point. Sealed are considered to sound “faster” FWIW. I haven’t owned any Rel subs, but they have a great reputation as a brand, especially for music.