You're not going to wear out a tungsten, or titanium carbide die in your lifetime, and probably not in your kid's lifetime, if you have any kids. If a carbide die starts scratching, it's not from being worn out, it will be from brass galling and sticking to the carbide, which can be removed with polishing.
If your current carbide dies are doing the job for you, there's no need to buy another sizing die. If you're worried about neck tension, then the first place to look is the expander. Most sizing dies size the case down enough, but expanders vary in size and they're usually the culprit.
The only carbide die I have that doesn't size a case down enough happens to be a Lee .45 acp carbide die that leaves the case at .470" in diameter. This works for .45 Colt brass, but is too large for .45 acp brass. In most calibers, especially handgun calibers, I have multiple sets of dies, so one die out of spec really doesn't affect my loading.
If it works, don't "fix" it.
Hope this helps.
Fred