FSMC mentioned specific shoes, but I’ll just expand that to say shoes in general, since shoes are one thing that the transfer tool ALWAYS butchers.
The next category would be things that could benefit from geografting in Genesis. Such as a proper mermaid tail, Creatura Serpenta and Creatura-The Black Widow (I’m not sure if the black widow would actually work as a geograft, but I still want it for Genesis whatever form it is implemented in).
My next category would be some old classics that get butchered by the transfer tool. For example,
0009 Uniform for Aiko 3 (the buttons on the jacket get smeared by the transfer tool making it unusable on Genesis, which is a shame since the jacket would be great for kitbashing)
Another category is older stuff with skirts, another item that the transfer tool usually butchers. For things in the DAZ store that suffer from this, I’ve always personally really liked Dementia for V4, but this would be riskier as an update to Genesis since it’s a pretty iconic outfit that’s been used a lot already and doesn’t have the same kitbashing potential that the jacket from 0009 does.
And the final category for me would be stuff like swimsuits and dresses that convert with unnatural breast following (“supercling!”) that even the Genesis breast correction morphs pack can’t really fix.