The first thing to do is elimnate any tire with a puncture or a repair. Those would be suspect.
Then look at the date codes. If you want to know how to read a date code:
Barry's Tire Tech
Completely elimnate any tire older than 6 years.
Then look at what you have left. It would be best to have 4 tires that are the same make and model regardless of the rolling resistance. Safety should come first.