I think any brand large frame revolver in .38spl will be low recoil and stop a threat. I have a S&W 686 and my mom has a Ruger Speed Six and 38's out of either gun feel like a .22lr. I will disagree with the recommendation on the PX4 have low felt recoil. I have owned two of them and sold both due to snappy feeling recoil compared to a Glock 19/17/17C or CZ75 in the same caliber.
I think the PMR30 is a good recommendation as well, but will not stop a threat as quickly but gives you WAY more tries at it.