Your term bundle is a little confusing. There are “EXZs”, which give you new drum sounds plus drum midi grooves. And then there’s Drum Midi Packs, which have no extra sounds, but more grooves. And if you purchase a Bundle, you will save some cash by buying many at a time.
I like the Hard Rock EZX. The newer Classic Rock is fantastic all depending on your flavor of “Rock”.
If you’re just looking for grooves and not new sounds, you can audition all of Toontrack’s Drum Midi grooves before purchasing. Check out this video starting at 12:24
