With that proviso - - -
WIll one hold up better than the after a few hundred rounds of standard-pressure .38 Special?
- - - I don't think there would be any problems with either one. The difference really begins to show when you feed either one a steady diet of +P factory or heavy hand loads.
The lockwork of the D frame Colts
IS generally considered a bit less robust than that of the K frame Smiths. This doesn't mean the Colts are exactly orchid-like in their delicacy. When Colt brought out the Police Positive Special, they lengthened and strengthened the frame, and heat trteatment was fairly well advnced by the 1930s. I've done a fair amount of shooting the D frame Colts, and they've held up quite well.
I would have no qualms at all about carrying the PPS, shooting standard factory loads for practice, and even carrying the 158 gr. LSWCHP+P for personal defense. The latter load is of somewhat less pressure than the old Remington High Speed and .38/44 loads of yesteryear, and there were a LOT of them shot in the smaller Colt revolvers. The 158 gr. LSWCHP+P load doesn't seem to have the sharp recoil of the 110 and 125 gr. JHP+P cartridges, and I believe it is somewhat kinder to the light-frame revolvers. I use it for carry in my alloy frame Colt Agent, but as before, I tend to practice with wadcutter target loads and the standard velocity 158s, and probably only shoot about a dozen +P loads per year in it. I do the same thing with my S&W J frame Airweight M37.
Another factoid, dealing with raw strength rather than lockwork durability: Note that the bolt lock cuts of the Colt are set off to one side of the chambers, while those of the Smith K are right on the thinnest part of the cylinder. This gives much the same effective cylinder wall thickness for both revolvers.
Another observation: Both Los Angeles PD and NYC PD used to issue colt Detective Specials to their plain clothes officers. I have read that both departments required their personnel to do monthly qualifications with service ammo. The DS, as noted above, is merely a shorter-barreled version of the PPS, and, due to the shorter tube, is actually a little lighter.
Cosmoline, in your shoes, I'd follow my inclination and get the PPS and be happy with it. BTW - - - If you want some slightly fuller stocks, check CDNN website
www.cdnninvestments.com where they have a huge stock of handgun stocks, both wood and rubber.
Best,
Johnny