Better at What? Jazz Is Too Broad! If You Were to say Greatest Impact It Would Be Wes Montgomery.

By far Wes Montgomery has been the most influential thus far. I would go as far as to say Wes was the biggest leap into modern jazz guitar. Of course other players like Jim Hall affected so many guitarists… however, the instrument didn’t really do the harmonic and rhythmic things prior to him. In addition, his writing and arrangements for guitar led the instrument in a direction unparalleled at the time.

Taken from wikipedia:

“Many jazz and rock guitarists today list Montgomery among their influences including: Carlos Santana, Jimi Hendrix, Pat Martino, Lee Ritenour, Pat Metheny, George Benson, Pete Smyser, Chris Standring, Eric Johnson, Steve Howe, Yoshiaki Miyanoue and Joe Satriani. American guitarist Emily Remler entitled one of her albums ‘East to Wes’ in tribute to him.

By some accounts, Montgomery has been the most influential jazz guitarist of all time, whose style has transcended into other forms of music, including Rock ‘n’ Roll, Soul, and Rhythm and Blues.[citation needed] Many songwriters and composers have written musical tributes to him, including Stevie Wonder and Eric Johnson.”