Jazz guitar players are generally considered gifted by higher technical skills than others, maybe because of their aptitude to the improvisation and fast soloing. Often, they are also provided with a special familiarity with chords, "licks", melodic phrases and ideas. Instead, as blues guitar players tend to play around a standard progression of chords, with quite standard style, they are often considered a step beneath, at least under a technical point of view. Obviously, in the music history there have been extraordinarily talented blues players (B.B. King, Ray Vaughan...) and, as a consequence, this supremacy cannot be deeemed true in general. But, if a beginner would make a decision to start playing jazz or blues (he likes both the same), preferring that one which "demand" less commitment in studying theory (hours of study) and in training the technique (hours of exercises), which one would you suggest?
Jazz guitar has considerably more variations in chords and progressions to learn, than the majority of most blues. If you're not constantly playing them , you forget them. The music is more complicated as well. I would have to say that as a guitarist, I find blues much easier to learn and play as opposed to jazz.