I have Master, Visa, AE, and Discovery, just to cover all basis. And the decision to use which one is purely based on the rebate economic. The 2% rebate Master got used the most, while the 3% gas rebate on AE or Discovery got used when filling gas. Only when all else failed I would use the 1% rebate Visa. So the "marketing" campaign by Visa in Olympics have 0 effect on me to use Visa in the future.