Awwww, Jeff.... they're ADORABLE!!!
I choose kitties who choose ME! I know that sounds crazy but every cat I've ever gotten was because of the eye contact and the way they reacted to me. When two strays were born on my Mom's carport, we waited till they were weened and decided to take one home. I sat down and said to them "okay, guys, who wants me to be their Mama?" One sat still while the other, my Xena, climbed up my lap to my face and looked me in the eye like "you are MY human!" She's been my baby for nearly 5 years now! Her brother went to my niece in San Francisco.
Choose by temperament, too. If you and your wife prefer a gentler cat, check to see which one is the quietest. If you like feisty, choose that. Most kitties are born with their temperament and you will have no problem figuring that out.
And, of course, the BEST answer has already been said, GET THEM BOTH! My kitties are so wonderful together!