Revisiting this thread, I think 357 is kind of a crazy choice for "target shooting" or would require a very precise context. I believe real target contests, whether bullseye or rapid fire, involve low recoil guns for the most part. Of the two caliber choices allowed, I would go with the 9mm.
That said, my 4" 686 is very accurate and quite satisfying to shoot. I wouldn't consider a 50-100 round outing fun though. The 5" GP100 is even better but without the slick trigger job I have on the 686.