I have both Superior Drummer 2 and EZ Drummer 2, along with MANY sound packs for each. I had Superior Drummer first and it was my "go-to" drums whenever I recorded a song. But ever since EZdrummer 2 came out, I'm finding that I like many more of the sounds I get "out of the box" from EZD2. In fact a good portion of the sounds I get out of Superior Drummer, I don't really care for. Even the most recent packs don't sound as good as most of the EZD2 sounds.
And since I don't do a lot of tweaking, except for maybe turning up the room mics in the mix, I use EZD2 almost exclusively now, with Superior Drummer just taking up space on my hard drive.
I agree with the person who said that Superior Drummer WAS 'superior" before EZD2 came out (and its many sound packs), but I don't think that's true anymore, unless you are someone who likes to tweak endlessly or add producer presets to Superior Drummer (which is also a system hog, if you add to many of those producer presets).
But again, no griping here. Toontrack general offers quality sounds, in both it's drum line and it's keyboard line. I would love to see what they could do with a Hammond B3 organ. Ever since Native Instruments discontinued it's "B4" and replaced it with "Vintage Organs", there hasn't been a decent Hammond organ. There are a couple of shareware and low-priced B3 emulators, but still nothing has matched the quality of NI's B4.
Keep up the good work Toontrack!