die sets, carbide?

I don't know why my question didn't show up but I'll just type it again.  I need to buy die sets but I don't know if I'm suppose to buy regular ones or Carbide ones.  What is the difference? Thanks

In 30 carbine, cases must be lubed whether or not the size die is carbide. Big advantage to carbide is much greater die life, much greater scratch resistance, and if you scrimp on lube the case probably won't get stuck.

I lube every 3rd 30 carbine cartridge, any more and the die and the press get all sloped up.