As far as brands go, when we get more hardstyle bells, they'll be the
Metrixx Classic from kettlebellsusa.com. We've had a full set of Rogue bells, one Ader, a pair of Punch, and worked extensively with DD bells in the studio, which is when I started to much prefer the E-coat finish found on the Dragon Doors to the powder coat found on our Rogues.
The studio only had one 28kg, so my coach brought in his Metrixx Classic 28kg so that I could work with a pair. I could
not tell the DD and the Metrixx apart. Since then we've picked up a 40kg Metrixx Classic for home use. The KettlebellsUSA website isn't the most confidence inspiring, but I'll never buy a different brand of cast iron bell again.
My wife prefers competition bells due to the narrower handles, so we sold our Rogues to get a set of the Training Bells from Vulcan Strength. You can probably find the discussion here where they were recommended. They're great bells, and we got them 40% off with free shipping on Black Friday, but some still haven't come. They're stuck in China. The ones that have come are nice. The handles are a little wide and tend to hit my inner thighs when I swing. Beyond that, no complaints other than customer service. The handles do have more texture than I'd prefer.