To me it´s the same.I have the best and easiest results with Toontrack SD.
Years ago I started with Battery 2, but this is as static as the session drummer 3
(really like the Old Zep Kit) which is really toooo muuuuch work to make the drumclips
of it by handwriting the timing /expression so alive,that it sounds like a human drummer.
There have been some really good special deals so I got first the EZ drummer and than an
upgrade offer which makes the SD drummer a no brainer .
The velocity and humanizing features make my life much easier !