Liking/loving one set of figures doesn't mean that has to be the only figure that you use. Figures are like any tool in an artist's repertoire you use the best one for the job you are doing.
I'm the same way, Pen. Genesis 1 is definitely my primary figure to render with. But I still use my Gen3's, sometimes even my Gen2's. Dawn, Dusk, and Luna see use from time to time, as well. They would probably see more use if there was more of the kinds of items I needed for them, but they are starting to appear here and there in spots in my artwork.
I use whatever figures I know I can get the right appearance to my characters on. Nataani is one of mine. Dusk just took to his features much more closely to what I had in my head for how he should look. I actually tried to build on him Genesis 1, the G2M and the G3M... then on a whim I tested him out on M4 and M3. Nope, it just didn't look like Nataani to me. Dusk however, suited his shape very nicely once I got my hands on that head resource kit from Chris.
Figures, props, shaders, they're all tools. I use the HW figures for some stuff, I use the Daz figures for others. I love the look of a lot of the toon figures - they are just adorable!! But I don't render toons, so I don't buy them. I like looking at the stuff other folks make with them, though.
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@paganeagle2001 You said it so much better than I could have. Hats off. Very well stated and eloquently written. Thank you.