Bass heaven = A grinding, growling Spector (a la Eddie Jackson of Queensryche on Operation Mindcrime/Empire albums). Melodic, supportive grooves and basslines of classic 70's bassists like Peter Cetera, Tiran Porter, John Deacon, Paul Goddard, Dee Murray, Rutger Gunnarsson, Joe Puerta, David Paton etc. Active PJ style basses. Beautiful mwaaahhhing fretless tones.
Bass hell = 6+ string basses, slappers demoing gear and making it sound like they're falling down the stairs, players more concerned with showing off technique/note count than locking the groove.