I'd say they are roughly equivalent in their air handling abilities. They both have more than one intake and more than one outflow fans, so that is good. I would go by which case meets your needs best in terms of front panel ports and general styling.
I think ( and I could be wrong ) that antec has been around longer also there sold at retail locations like bestbuy ..My personal preferences aside the haf is popular for a reason that I cant dispute . I just prefer something that dosnt look like it belongs on the playground