Both of these guns are originals. None of this lawyer lock or redesigned lockwork. These are originals six inch lead launchers. The Colt is from 1978 and the S&W is from 1988.
The Colt uses a "V" mainspring, not flat mainspring (though the "V" shaped spring does happen to be flat). Because of this, the Colt is long action and S&W has a short action design. All things being equal, the Colt's long action double action pull will feel lighter through the longer arc since there is more leverage.
The Colt has a 8 pound double action pull and the single action weighs in at about 3 pounds while the S&W is at 10 pounds in double action, but the single action beats it at about 2.5 pounds.
Which would you choose?
Luckily, I have both!