I can not say for sure about this.
If you think you have time to spend on clay sculpting,it’s ok for you and good for you to practice.
It does not need to do Clay sculpting before you can create 3d,actually it’s the same way you do in clay sculpting.
You just need to learn how to work with tool and options.
The most important thing is human anatomy without strong knowledge about human anatomy practicing with clay sculpting or 3d sculpting won’t get you anywhere as well.
It’s easier to sculpting in 3d because you can edit anywhere,anytime,no resource are wasted.
Your choice and welcome to 3d artist world.