Different ages need different toys, so we can't generalize. There is an article about Baidu's experience. You can refer to the "Principles for Choosing Baby Toys".
So are baby toys plastic or plush? This must be a big argument. I can suggest the plush fabric is good. Babies and children choose plush toys with soothing effect in infancy, which largely solves the baby's fear of the world.
In principle, babies like toys such as soothing, ringing and bed bells. When choosing toys, you can't just choose according to adults' own tastes.