The material of the soleplate is important for two reasons: How well the iron glides over the fabric, which determines your ironing speed. How scratch resistant it is and thus for how many years it keeps maximum performance.
Check out this list of things to look out for when buying a new steam iron or steam generator iron. If you just got one, this is where you can confirm that you made the right choice. Whatevery situation you‘re in: The name Braun on the iron is always a very good sign.