I'd prefer to carry my 4" M29. I shoot it well and quickly. 20gr. W296 or H110 and hard cast 300gr. FN.
I suppose a cat might ne better dealt with using 180 gr. HPS at 1,400fps. Maybe it doesn't matter.
My little Colt Poice Positive .38SPL would remain home. It also shoots well, but I trust the .38, not at all.