Lead guitarists are typically responsible for playing solos, which are melodic improvisations that showcase their technical skill and musical creativity. Lead guitarists often use distortion and other effects to add sustain and expressiveness to their playing.
Rhythm guitarists, on the other hand, provide the rhythmic foundation of the music by strumming chords or playing arpeggios. They often use a clean or slightly distorted sound to ensure that their playing complements the lead guitar and other instruments in the band.
In general, lead guitarists are more likely to be in the spotlight and receive more attention from the audience. However, rhythm guitarists are just as important to the overall sound of the band and play a crucial role in supporting and enhancing the lead guitar and other instruments.
Ultimately, the "best" guitarist is the one who best complements the music and the band's overall sound. Both lead and rhythm guitarists can be equally talented and contribute significantly to the success of a band.