No offense to the suggestion of the M60-15 .357 3" but I would suggest you go with a "K" frame if you want the additional .357 option. The "J" frame in a .357 isn't much fun to shoot and can be a challenge to master without a lot of range time.
Gun Review: Smith & Wesson Model 60 - The Truth About Guns
The J-frame revolver is itself more or less an "experts gun" when it comes to effective self defense. If you're going to carry one and expect to be able too employ it effectively, you need to shoot it a lot.
If you do that the major objection in the truth about guns article becomes a non issue. The DA trigger pull isn't bad. It's capable of 3" accuracy off hand with a 2 hand hold - even DA - but it takes a good deal of practice to develop and maintain the skills to do it.
Staging the trigger consistently with a two hand hold can be done consistently with a consistent grip with placement of the weak hand thumb so that the end of the trigger finger just meets it as the bolt rises into the cylinder. In my case, that means placing the pad of my thumb right at the point where the rear of the trigger blends into the bottom of the frame. The end of my thumb then is the point where the tip of my trigger finger need to stop, then hold pressure and squeeze to deliver the shot when the sight picture is right. It's one method to help develop the motor loop needed to stage the Model 60 reliably - although I still would not recommend staging the trigger in a high stress situation.
This group was shot for this month's snubby match this afternoon with 5 shots DA strong hand only and 5 shots weak hand only at 25 yards. Single hand shooting does make the DA pull more challenging, particularly with the weak hand. However, even single hand, weak hand, it's still a sub 6" group, and it's on point of aim.
I've read from various sources, including some here, that much of the advantage of .357 Magnum ammo is diluted or lost when it's fired from a snubby, and .38 Special +P or equivalent is a better choice.
I agree that the average .357 load is not all that efficient in a short barreled .357 Magnum. I'm not overly impressed with .357 mag loads in my 2.125" Model 60, but on the other hand with the right load, it's not bad in the 3" Model 60.
I use 8.5 grains of Unique under a 125 gr XTP and it produces right at 1300 fps in my 3" Model 60. Now that's not barn burner performance by 4" or 6" .357 Magnum standards, but it's a load that has comparatively little muzzle flash relative to a slow burning powder such as 296 or 2400, and the recoil is manageable with a slightly larger grip like the Hogue Monogrip.
That 1300 fps velocity compares to 1100 fps with a .38 Special +P load with the same bullet, so you're getting an extra 200 fps over a +P load without much downside.
On the other side of the coin, with a +P load the recoil in a properly gripped 3" Model 60 is pleasant enough that you'll shoot that load on a regular basis.