Tub material

[Terry Royce]

We are rehabbing a house for ourselves to move into.

I have a question on tub material. how good is a porcelain on steel tub as opposed to a cast iron tub?

These tubs are a third the price and porcelain on steel seems like it would be durable and sturdy.
Here is the one I was looking at:
http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100389010&N=502513+4294965152+90043+4294940510