Maybe the Japanese Laserdisc would have better audio, but it still commands crazy high prices even today.
http://www.lddb.com/laserdisc/17101/HCL-7001/Transformers:-The-Movie
http://www.lddb.com/laserdisc/00171/PILA-1495/Transformers:-The-Movie
The 1989 LD has Dolby Surround English audio, while the 1998 one has only mono. I wonder what audio tracks were used in that project of the Australian BD with all the bonus features here.