I think the advantages or disadvantages to having either would be minuscule. I prefer a revolver with flutes, but that is just aesthetics. The reason I picked the Pietta 1860 Army clone I bought back in the '90s was because it has flutes.

Hawg, What front sight did you put on the 3-5-7 686? Size/Height? I have the same gun and was looking to put a FO sight on it. Have been going back and forth between an XS big dot and the fiber optic.
If you look closely on the pinned front sight in my pic, you'll see that it's an SDM Super Sight. Check them out...it works well and they're relatively cheap ($28).
SDM Fabricating Home
To me the Classic Hunter is the best looking of all the modern Smiths …
The model 610 is sharp with the unfluted cylinder.
The classic hunter is my favorite pistol, but S&W has put out so many unfluted versions it has kinda lost its distinction. Nobody remembers it as a 1 in 5000.
Mine was tuned at the Bill Davis service center way back when.