Credit Card to use when traveling

We have three different cards that give us points with Hyatt, Starwood Group, and Holiday Inn hotels. With our trips in the USA, Central America, and Europe we have had free rooms 9 out of 10 nights over the past 5 years that we have done this. Best part is that the points but us in the frequent visitor class by the hotels so we get the executive level rooms, free happy hour, and other concierge level services as well as the free room.

The only exception is the AMEX card we use at Costco.