1. Randy Rhoads: Randy Rhoads was a pioneering and influential guitarist who played with Ozzy from 1979 until his tragic death in a plane crash in 1982. He is widely considered one of the greatest and most influential guitarists in heavy metal history. Rhoads' playing was characterized by his neoclassical style, fast and intricate guitar solos, and harmonic techniques.
2. Zakk Wylde: Zakk Wylde joined Ozzy's band in 1987 and played with him for several years, contributing to iconic albums such as "No Rest for the Wicked" and "Ozzmosis." Known for his intense and high-energy performances, Wylde's guitar playing is marked by his heavy riffs, distinctive vibrato, and use of pinch harmonics.
3. Tony Iommi: Although not a full-time member of Ozzy's band, Tony Iommi, the legendary guitarist from Black Sabbath, has collaborated with Ozzy on several occasions and has contributed his distinctive and powerful playing to some of Ozzy's songs.
It's worth noting that other guitarists have also worked with Ozzy throughout his career, and these musicians have contributed their talents to various albums and live performances. Ultimately, the best guitarist for Ozzy Osbourne is a matter of personal preference, and there are valid arguments to be made for each of the guitarists mentioned above and potentially others as well.