Not to be a "stick - in - the - mud", but I for one do NOT subscribe to the one-gun does everything theory. There are concealed carry guns, hunting guns, house guns, Military & Police guns, special purpose guns, etc. etc.
When you ask for a Best .357 I can see your point of interest and or curiosity, but more specific parameters are needed IMHO, like what the purpose of said gun is for.
A 8 3/8" M27 is one of the TOPS for hunting, but would be a poor choice for concealed carry. While a M19 6" revolver might be a GREAT house gun and an adequate small game hunting gun, again I would not reco it for CCW. A M60 would be a GREAT choice for CCW, but a poor choice for target shooting, hunting, or Military purposes.
So I will give you multiple answers here:
Hunting Smaller Game Animals: M27 6" ....... Strong, accurate, stable platform, will handle the use of HEAVY Magnums all day long, beautifully made and attention to detail! S&W's premier .357.
Home defense gun: M19 or M586 6" ..... lighter in weight but will still easily be controllable with Magnum loads. Nice point-ability, reliable, easily mastered, readily available for reasonable prices.
CCW: M65 3" ...... IMHO the BEST CCW .357 S&W ever made! Fixed sights won't hang up, relatively compact, light weight, still controllable in .357 with some practice. Gives better velocities with .357 Mag's than the M66 2 1/2" bbl. and I don't like carrying a concealed gun with adjustable sights.
M60: Best off left to 38 special's IMHO even though the more modern ones are chambered for .357'. You would be MUCH BETTER SERVED carrying Buffalo Bore HEAVY 158 grain LSWCHP-GC +P in a M60 than a .357 Magnum. In a 2" bbl. a lot of the powder that has to propel the .357 projectile is burned OUTSIDE the bbl. thus is not propelling the bullet at that point. Too much recoil, too much muzzle flash, too much recovery time for a follow up shot in a 19 ounce revolver.
Well, you asked so that's my .02 cents..........
Regards,
Chief38