The half system seems to sound a little louder by a very small margin. The full system sounds a little deeper from behind. We just fired up my bike last week with Boosted's Termi full system on it and it sounds really good. I can't wait to tune the Nemesis this week. One of these days I may even be able to ride her again.
Making a decision based on a sound clip is a FAIL! A camera just can't pick up the true sound, nor can most computers accurately transmit, the true sound an exhaust makes. You will have to hear them in person to get an accurate assessment.