The advantage to a business card is to keep your expenses easily tracked separately.

The Alaska biz card is not a signature card so you won't get all the 'benefits' that come along with the Signature concierge service. I don't use that service so I find it not really worth it.

My main reason to pay the $75 annual fee is for the $50 companion. That one benefit pays for itself over and over. Especially if you use it with a paid F ticket (and go somewhere nice like OGG!!!)