Dan Wesson hands down.
Cylinders:
The 28 is built with pre-55 standards meaning the cylinders before 1955 were 1 9/16" long. 1 9/19" ='s short, bullets like the lyman 358429 classic keith swc 173gr bullet or the 358311 rn are too long for the cylinders. The dw cylinders are the same length as the s&w l-frame series and will accept longer loads/bullets than the s&w 28. When reloading/using 38spl's it doesn't matter, but these are 357's. Why miss out on some excellent loads/bullets due to cylinder length???
Barrels:
With the 28, you get what you see. With the dw you you not only get what you see but you also have the ability to set the cylinder gaps yourself. When fine tuning loads you'll find that some loads like shorter/longer cylinder gaps. I've ran the cylinder gaps as short as .002" on my dw's. Buying aftermarket bbl's are super cheap for the dw. You're not locked into the standard 1 in 18 3/4 twist that are standard on both dw's and s&w's. I should point out that dw did make a 1 in 16 twist for their silhouette bbl's & any spl twist bbl's dw made are marked on the side of them. You can buy custom bbl's cheap and with 1 in 10 or 1 in 12 twists to take advantage of the longer/heavier bullets.
(Back in the day the built target pistols based on the s&w frame, s&w had excellent triggers. They'd put colt bbl's on them, the colt bbl's were 1 in 14 twist and were excellent at stabilizing the longer bodied 148gr hbwc's).
Sight:
There's allot more choices out there for the dw's. sights. They are easily replaced, the early models have a pin holding them and the later models have a allen screw holding them in. Again for little $$$ you can have fiber optic front sights, colored insert (like in your picture above), black standard rounded for holsters of target partridge style and several different heights. Along with the ability to change the height and color of the rear sight.
Barrel shrouds:
With the 28, what you see is what you get. You can have the same 4"bbl on the dw and have the same ribbed barrel or a low profile sight with the same ribbed bbl (better for conceal/holsters) or a vented rib or a heavy shroud. You actually have all those different choices with any length dw barrel.
Accuracy and bbl tuning:
Not only can you fine tune accuracy with the bbl gap on the dw's, you can tune them with bbl tension. The dw bbl system is stress free and s&w started using the same setup with their x-frame line. The only difference in s&w glue their bbl's in. Tightening the front bl nut on the dw's allows the owner to tune the bbl to the load by increasing or decreasing the amount of tension on the bbl (think guitar string).
bbl add-ons:
All dw bbl's are threaded and can accept things like muzzle breaks, cans, bbl weights for target work, etc. With the s&w's what you see is what you get.
I'd take the dw's over the 28 any day of the week and twice on sunday. Oh, wait a minute, I picked these up on a sunday gunshow.
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Those dw's are setup for beating and banging on steel with full house 357's. They have heavy bbl shrouds (the 4" setup weighs the same as a 6" bbl'd 586/686), custom 1 in 10 twist bbl's (heavy/long bullets) and muzzle breaks that tame the blast from the full house loads. Add trigger jobs and the rubber grips and these dw's flat out shoot.
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Those long 4-holed muzzle breaks are the cat's meow and really show their worth when shooting 173gr to 180gr bullets with full house loads.
But ,I also like to shoot the dw's with standard 4", 6" & 8" bbl's also.
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There's nothing wrong with the s&w 28 it's just that the dw brings so much more to the table. I'd highly recommend the dw over the 28 for the reasons listed above. At the end of the day 1 firearm can be used for ccw, plinking, custom setups for bowling pins/steel, target work, silhouettes, hunting, etc. Whith the 28, what you see is what you get.
Just another opinion.