For a one-gun .357 shooter, (and as a companion piece to a Marlin 1894 carbine also in .357), I'd vote for a Model 66 Smith...and make it one of the early ones. The lighter weight, ~38 oz., is a real boon to all-day carry when compared to any of the heavier models: 586, 686, or any of the "N" frames: 28 or 29. Yet that same weight allows it to handle modern full house loads when necessary. But a close 2nd choice, if you're brawny enough to tote the weight, would be a Smith M27 with a 5" bbl. This latter was Skeeter Skelton's personal choice for a one revolver man, IIRC. I have one, love to shoot it, and it may be the most accurate .357 I've ever fired, but the weight....just too much on the gun belt at age 75.
But back to my #1 choice, the stainless steel construction of a Smith 66 makes 'in the field' maintenance a breeze when compared to a model 19 or any other blued gun. Both are great guns, and for sheer beauty, nothing in a revolver beats a model 19 Smith IMHO, but a SS 66 just makes more sense to me when far from the chimney smoke.
As to barrel length....it's gotta be 4"....long enough for good sight alignment, but short enough for easy concealment under a shirt tail. That same 4" length, also makes for significant velocity gains over a 2-1/2" or 3" tube.
Loads: Heck both my Smith M-66 & 19 do right well with cast LSWC's and 13.5 gr of 2400...a sub-2" load at 25 yds in my guns. And the same load does the same at 100 yds from my Marlin 1894 with a Skinner Peep mounted. That's a pretty fair deer combination if nothing better is available...and offers all the penetration one could ask for in CC applications. For jacketed bullets, I like 158 gr. XTP's on deer and for defense, backed by Win 296 giving me 1250 fps from the revolver and well over 1550 fps from the Marlin. This is a combination made for deer hunting inside 100 yds.
For target panning, any good wadcutter with 3.0 to 3.5 grains of Bullseye in .38 Spl. brass will cut ragged holes, offhand, from 15 yds with a competent pistolero doing the steering. Bump that up to 4.0 grains in Magnum brass and you've got a 1st rate defensive load that'll show 900 fps + on the chrono screens....it's just a mite short of what the FBI was issuing back when they carried 3-1/2" Model 27's at the 4:00 o'clock position.
Stocks: I REALLY LIKE Miculek's DA grips. They're at their best with DA shooting, (who'd a guessed?), but do very well in SA too. Mine are checkered allowing no slippage during a 6-shot string, but do abrade the palms over a morning's shooting. Jerry, as I understand it, prefers the smooth ones which allow him to correct gripping errors while in motion. Another good choice is the Hogue Monogrip...I have a set on one of my model 60 Smiths with a 3" bbl. That light weight gun is no fun with full house loads, but the Monogrip keeps the pain to a bearable level with no knuckle rap.
If it's a one .357 to do it all...make mine a Smith 66...my current one is a 66-2...a former LEO turn-in...that has the smoothest DA trigger I've ever found on a Smith...and padnuh, that's saying something. Pic below: my M-66 in my carry rig here on the farm...Miculek stocks and a home brewed holster.
YMMv, but heck, I'll not hold it against you. Best Regards, Rod