What is the differences between the following racks other the the $100 price and one being Al and other SS
http://www.tubus.com/en/rear-carriers/cosmo
http://www.topeak.com/products/Racks...larRack_w_o_sp

I just finished building a tour/commuter and looking for fit racks and panniers.

I am looking for a quality rack and found Topeak for $40 and the Tubus for around $120ish
I am looking for something that will work well for Credit Card Touring 5-50 days and work commuting