Mikey:

You might want to consider who converts by determining where the two of you might go on vacation as a couple. If it's internationally then look at who provides the most available seats using points and also consider their partner airlines. My wife and I faced a similar situation when we got married many years ago. We decided to not focus on one airline but on several. Now we have about 500k each in AA, UA, and DL. With that we have a very nice selection of travel options available to us. This is very important when kids come into the picture. Kids have a tendency to dictate your travel destination.

Anywho... best wishes to those of you who are getting married