What's your credit card and why is it best for you?

[MoHasanie]

I live in Vancouver but I'm moving to Ontario. My credit card is with Scotia Bank. 

Airlines - Air Canada Aeroplan, British Airways Executive, Lufthansa Miles and More, Emirates Skywards, Qatar Airways Q miles, American Airlines Aadvantage. The most useful is Emirates Skywards since its the easiest to get upgraded to Business class.

Hotels - I signed up for all the main one's but have only earned rewards for Marriott Rewards and Hilton Honors.