I traded off a Security Six, didn't shoot .38s to my liking. It was fine with a 140 JHP magnum. I picked up a Taurus 4" 66 some 10 years or so ago and that thing is awesome with either .38 wadcutter OR the 140 Speer. It has a great trigger and is very accurate and pretty well built, though it's not a Ruger. I think it's a little stronger, at least in the area of the frame where the forcing cone resides, than a K frame, though. The K frame has a flat bottom to the forcing cone necessitated by the lack of room there. The Taurus has a ROUND forcing cone. That's a biggy for me as I've had a K frame split the forcing cone at the flat part.
Suit yourself, believe the bashers if you wish, but I vote Taurus. I have two 66s, an older 80s 3" and the early 90s 4". They're both tack drivers and perfectly reliable with good/excellent triggers. I generally shoot my 4" 66 in preference to my Smith M10 for matches with our club, slightly more accurate and the trigger is just as good. That's an early 60s M10 in great shape. It started out as a pencil barrel, but I had a heavy barrel installed after the forcing cone cracked.
