The other thing to think about is re: Audi, is that they have an established relationship, so that the deal will be much easier to get over the line.
And he will also consider the status of those brands. Here is the ranking of those mentioned, in the top 100 or World Brands.
6th Samsung
38th Audi
GoDaddy and BoA do not feature.
Audi considered more of a luxury brand to Samsung though, and that is also a benefit in attracting other sponsorship and deals for the club, as they want to be associated with the Swans.
Samsung already have a big PL presence, so they have a much greater bargaining power, making the deal harder to make, and probably not as lucrative.