It's very difficult to pick one. Some favorites: Oistrakh/Clyutens, Perlman/Giulini, Szeryng/Haitink . . .
I always enjoy hearing Grumiaux's suave, elegant sound, but I'm not sure he has sufficient thrust and heat for it to be a favorite with LvB's Violin Concerto. . . . On the other hand, Grumiaux's strengths mesh well with Davis' interpretation, which emphasizes delicacy and inner detail over drama. It's a Francophile/"low countries" approach to Beethoven, I suppose, instead of the big-"R" Romantic way we typically associate with the German tradition. . . . Or at least that's how I've interpreted their interpretation!
So which Beethoven VC recordings are your favorites?