Visa, MC, Discover, Am Ex - which do you carry?

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Just out of curiousity. Which of these do you carry? I have both a few visas (2 check cards), 1 visa credit card, and 1 mastercard credit card. Although when I applied initially, it gave me the option, I decided to go with Visa & MasterCard mainly because they were the most accepted. Some places, especially smaller businesses, for some reason don't take Discover (sometimes) and AmEx (often). What kinds of cards do you have, and why did you pick them?