I don't use Daz so I can't advise on that specifically. What I can say are generalizations I've noticed with the render engines in Poser and Blender, as well as a short stint with Reality. I'm also assuming that since you're a vendor you're hoping to get the best look without postwork since that's not allowed in the MP. In my experience, you need to have high enough render settings but things like proper lighting will help also. I've never seen these things being affected by the graphics cards. The only improvement I've seen is speed so I can use more lights or higher render settings and not have it take a long time. However, I also have to say that "a long time" is subjective. Switching from an 8-core CPU to an RTX 2060 for my rending makes things much faster in my book. It drops from hours or overnight to usually about 20 to 30 minutes. And I'm happy with that. But people with an RTX 4080 or 4090 will say my renders are so slow.

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