My answer after having a few is a 357PD 4" in 41 Magnum. Tried the 629 4" really got heavy on the hip. Had a 586 357 Magnum in 6" try sitting down with that on the hip. Given that you have a model 57 then I would pick it. The 357PD is perfect for me, light weight, not brutal to shoot and power enough for anything that should be shot with a revolver.
