The card I use the most (when not trying to hit a bonus or not in a 5% bonus category from my Freedom or Discover) is my Southwest Visa.

1.67~ish cents per spend and I travel in the US much more than overseas. I love the fact I can book a flight and cancel at anytime and I get my full amount of points left. This makes sure I can get a flight anywhere/anytime basically.

Also if the rate goes down, I rebook and get the points back. It's a great way to set me up to go somewhere further.

I know many hate Southwest and it has it's issues but love how flexible those points are.