Thank you guys for the replies. I really appreciate the information.

It does seem like using the same group of RealTracks/RealDrums in different styles, say Country vs. Jazz vs. Rock, generates essentially the same result.

Another question in the same vein...

Does the style choice greatly alter the generation of the same MIDI track (vs what it does for a RealTrack)?

Outside of grouping a particular set of instruments/tracks (MIDI or Real), what does style choice really alter?