If you want the definitive "I watched this after school in 1999" experience, search specifically for the "Toonami Broadcast" rip. The audio quality is grainier, but the timing of the music cues during the Frieza fight is objectively superior to the modern remasters.
: For those looking for nostalgia, there are uploads of original Toonami broadcasts including the iconic intro and commercial breaks for specific episodes like "Cell Juniors Attack". dragon ball z all episodes internet archive