$375.00 is a good selling price for both revolvers, but the Colt is a better value for that price, plus the advantage of six rounds as opposed to the 5 round capacity of the Smith.
The Colt is rated for +P .38 Special, which is entirely adequate for most purposes, without the muzzle blast and recoil of .357 Magnum ammo in the Smith.
The nominal unloaded weight of the Colt is 21 ounces, add a couple of ounces for the shrouded ejector rod.
No question in my mind. Invest in the Colt Detective Special.