Science be damned! Onwards with subjectivity!
• 24-bit audio is magical. When I recorded myself playing guitar in 24-bit and played it back through my amp, it sounded like I was still playing. 16-bit sounded like a CD.
• With MP3s, 192 kbps is a huge step up from 128 kbps. 192 doesn't exhibit any of the "swooshiness" heard in the upper range of 128 kbps MP3s for regular rock/pop/hiphop music.