The complete sonatas were recently reviewed on Radio 3's Building a Library programme and although the reviewer was complimentary about the Capucon?Braley set he preferred the Faust/Melnikoff pairing due not only to their undoubted nimbleness of playing but also I think to their claims to 'authenticity'. I don't intend to join the debate about modern versus period-style performances (both can be good and both can be bad) and certainly not pit myself against a professional musicologist but for me the astringent violin tone adopted by Faust was altogether too much of the hair shirt. The Capucon/Braley approach, undeniably modern in approach, provides a well-upholstered sound with imperious, almost insouciant, playing from Capucon.
I already had the Oistrakh/Oborin set from which I would not like to be parted, and it still sounds well enough, but when I heard the sheer gloss and opulence of the Capucon set, I had to add it to my collection.
Incidentally, two of these sonatas have been recorded by Mullova/Bezuidenhout and an extract was played on the programme perhaps for those who didn't require the whole set and would settle for an intermediate approach between the 'authentic' and modern approaches. Mullova's rich and passionate playing very much in the Russian style and, to my ears at least, rather reminiscent of Heifetz, was such that if Beethoven had heard the like he would surely have made time to write 32 of these sonatas rather than the 10 he got round to. If she records the complete set, that will be something worth waiting for, at least if you are not a dedicated 'authenticist'.
The options are yours. Make your choice. Given the quality of the competition, it would be difficult to go wrong.