hii !
i use polymer clay (the kind you can bake in your home oven). more specifically, i have settled on a brand named "cernit". i have raynauds and hypermobility, so my hands are very cold, very weak, and very frequently injured. cernit clay is soft and gooey ! so it is not so painful for me to work with, and it also leads to more natural, accidental, melty kind of shapes that i enjoy in my work and wouldn't be able to reproduce as well if i tried with firm clay. the cons of this are that it is much harder to get specific shapes, as the clay doesn't like to hold its shape too much, it is much easier to mess up your work, and the detail level you can get is reduced. i have also had oven accidents with improperly balanced armatures that wouldn't have happened with firmer clay.
if soft clay isn't what you need, i worked with "fimo" for a while. it is a nightmare for my hands to knead, but you can do much more detail and need to worry less about your work slowly melting under its own weight. i love soft dreamy gradients, but sometimes you want clear borders between your colours, and fimo is much better than cernit when it comes to everything not blending together. if you don't want to paint all over your work, fimo has a larger and imo prettier colour selection. both brands come in various transparencies and effects.
hope this is helpful 💖 ty for the ask