Lasse... just my $.02 worth... This is a topic I'm completely torn over and go back and forth with just about every week!
I own S2.0 and the metal foundry and many other expansions and midi from literally all over, I have SSD platinum and I have Addictive Drums with the Metal expansion. I love and hate each of them for different reasons. None of them are for me the end all be all, but me being a guitarist, I have to rely on software like this to record drums and write parts with.
Depending on the type of music you're going to be working on, Superior will probably be your best bet.
I am so heavily torn over SSD because I absolutly love many of the sounds in Steven's software, but I have had huge struggles with the Kontakt player, and I don't even have SSD or Kontakt installed on my DAW at the moment.
With Addictive Drums, I'll load it up, and it many times I love the sounds I can get out of it, but I have this mental problem using it because the norm is that it just can't compete. I will admit that I have a hard time getting the kicks to sound nice. I had high hopes for the Metal expansion, but those dreams quickly went diving into the dirt. I'm not a fan at all of the AD Metal snare.
Then there's Superior. I've heard amazing recordings with Superior but usually with the kick and snare augmented, but I feel the cymbols and toms in Superior are difficult to beat. Superior is complex and theres a lot to get your head wrapped around, so it might take you some time to get it sounding the way you want it to. I'm still struggling with it!
Until SSD4's release, Superior possibly mixed with augmented kicks and snares is currently the best option in my opinion.