To answer your questions further Galaxy, I believe the Aurora is more a status symbol car, its a "fluff" car, I want to bring out the power that is all bottled up inside, and it definitely has a nice suspension, steering and ride of a Bonneville...but hang on, before I rile feathers....the options found on the 95-99 Aurora are now found on the 2000+ Bonneville. Pontiac finally learned its lesson after Olds bit the dust.
The Bonneville is far more aggressive....both with torquey power and aggressive styling. The Bonnie looks like a sport sedan...the Aurora really doesn't. However, the interior of the Aurora was WAY ahead of its time, and now the rest of the lineup (at GM) is finally starting to catch up.
Frankly the $10 500 I paid for my Aurora to get what I have in a 96 beats spending double that on a 2000+ Bonneville. It made sense to me at the time of purchase