I have yet to pick up the Miramax version of Zatoichi and can't really comment between both versions. However, I'm pretty happy with the Seville version even without Sonatine.
Joseph, I picked up the Seville version of Zatoichi. I believed that has all of the same picture transfer and extra as the Miramax DVD except that there is no Sonatine on the Seville DVD. Disc 1 contains the movie and Disc 2 contains the special features. I will be picking up the Miramax...