IMO it's personal preference and some are going to like stalsbergi mainly because they're something different. The gold edge rivulatus were a sensation when they first appeared in the hobby and would be just as much so today if they had just recently entered the hobby as a new fish.
LFS I used to visit had a large display tank full of orange edged rivulatus about 20 years ago and it was quite a sight.
As far as aggression, tank raised rivulatus I've had have all been relatively docile, including toward each other-- that's my experience, fish temperaments can vary so it doesn't mean you can't get an aggressive tank raised rivulatus. Docile doesn't mean wimpy, ime not much intimidates them, but mine were always tolerant of other fish in the tank.
On the other hand I've had wild rivulatus and they were a different story, very aggressive, constantly wanted to fight each other and just about anything else in the tank, right from the start at an inch and a half. So, imo, when some have said staslbergi are the more aggressive species, they've probably not had wild rivulatus for comparison.
