To the OP:

If you choose to go with genesis 2, it might get very expensive, even with the free Daz Studio. The base characters alone costs $44.95 apiece. And most content at Daz has skyrocketed in price recently. Of course, for your use, it might be enough to simply use the genesis 2 male and female bases, which are free with studio, but if you want more versatility, you need to purchase the character packs.

For the use you are describing, I would try out Antonia. She is free (at RDNA), weightmapped and has quite a few freebies available, both for clothes, poses and morphs. If all you need is a reference render, it should be plenty.