Is it better not to use hair color?

Hair color can be beneficial if you want a shade that better suits you. In most cases, the hair will feel softer and look shinier. The hair shaft will increase, giving it more volume. The only problem is retouching the hair that grows back, or your 'roots', which will be necessary 1-3 months after you dye it, depending on how fast your hair grows. If you color your hair too often, you will get increased split ends, so it is best to trim your hair when you see this.

Whether it is 'better' or not is up to you. It can't make your hair any less 'healthy' because it is already a collection of dead cells. It is all a matter of how you take care of it.