I have both Hotchkis and Hellwig sway bars. The Hotchkis bars are definitely prettier, but the Hellwig bars work every bit as well as the Hotchkis bars.
The only thing to keep in mind is that they don't all use the same end link location, so, you want to make sure you buy the right bar. If you have a '68-'72 K frame the Hotchkis bar uses a custom end link/sway bar tab location. If you want to use a similar location as the Hotchkis, use the Hellwig 55917. It's the "pro-touring" bar and like the Hotchkis 67-72 bar it basically uses the factory 73+ LCA sway bar tab location. The Hellwig 5906 using the factory 67-72 sway bar tab locations, but it also limits tire clearance to less than a 245 (like the factory bar).
It looks like the #55917 is also not in stock in a lot of places and won't be for months.