Before I entered LE I enjoyed a lot of target shooting and plinking in both SA and DA modes using my revolvers. Then, when I later started in LE, when service revolvers were still the norm, the bulk of my training and qualifying was done in DA.
Of course, back in those days there was some concern among LE that a revolver cocked into SA, with the usual light SA hammer pull weight, could become a problem with ND's when things got exciting and stressful. It was brought home to me when I learned of a case that occurred in a local agency, where someone was unintentionally shot & killed by an excited the cop holding a revolver cocked into SA. (This is one of the reasons why there were some agencies who ended up using DAO service revolvers back then.) Anyway, while we were permitted to thumb cock a revolver into SA if making an extended range, aimed shot (like 50yds or more), we were expected to shoot DA.
My first 5-shot snub revolvers had hammer spurs, meaning either standard (36's) or shrouded (like my original Bodyguard 649 .38SPL). I picked up an early SP101DAO (spurless hammer), and a couple of the original CA Bulldogs, at various times along the way.
Then, many years later I started shooting a training J-frame we had in our range inventory, one of the early 640-1's (frame marked approved for +P+). I liked the internal hammer Centennial style snub, and I ordered a 642-1 when they were approved for the use of +P. It was my first Centennial styled snub, as well as my first Airweight. It was a lot handier for pocket holster carry than my steel snubs, but the lighter weight took some practice when +P loads were being used. (I practiced by also shooting a LOT of the Winchester LE 110gr +P+ Treasury Load through the training 640-1, since we had cases of the stuff we'd picked up from another agency.)
Nowadays I rather like the Centennial style snubs, and own a pair of 642-1's, M&P 340's and a nifty 37-2DAO (with a factory spurless hammer). Doesn't mean I don't still like my spurred hammers, though.
The Centennial styled snubs are simply easier to draw from pocket holster carry, and I don't have to worry about hammer spurs wearing holes in my shirts and coats so much.