Aluminized or Stainless?

My aluminized 10 year old TTi exhaust is showing just a little rust now on the head pipes near the exhaust manifolds. I guess I have to sand the rust off, which might remove some of the factory aluminized protection, right?

I cannot vouch for the veracity of this short article, but interesting reading:

The Essential Exhaust Choice: Aluminized or Stainless?