I have not heard any of Szeryng's two sets. He was not that good in the violin-harpsichord sonata set with Walcha, so my interest for him has not become stimulated. Grumiaux I haven't listened to for many years. To day I would probably find even him too romantic.
IMO there is a lot of good versions, which are well integrated and convincing in their own right. I can mention Christian Tetzlaff and Susanne Lautenbacher again and add Ingrid Matthews and Viktoria Mullova and a lot of others e.g. Salvatore Accardo, Ida Händel, Karl Suske, Christiane Edinger, Ilya Kaler, John Holloway, Rachel Podger and Sigiswald Kuijken II, - you name them.
The artistic freedom must have a limit IMO, if an artist wants to be taken seriously nowadays. Of course we should admire an artist's technical powers, but it is bad style to play Bach with heavy vibrato in order to make his music eatable to listeners who prefer late romantic music.