Congratulations.
I too am getting married and have a slightly different issue:
My wife to be doesn't travel for work but over the past ten years or so has squirreled away a couple of hundred thousand AA miles from leisure travel. I don't have more than 20,000 or so AA miles. I on the other hand have ~300,000 miles between UA and US. She has essentially none on these carriers.
So if we're to take award travel together we're going to have to treat one another which I guess is not all bad.
She however loves AA and hates UA.
So for future mileage earning I am going to have to either convert her or switch over to AA. Or I guess we could "compromise" and select a third, new carrier of choice but out of ORD that's not terribly attractive. I posted on the AA forum that I was considering a switch (I hate RJs too) but got few responses.
What to do.