Hi!
Since there are 3 ways to get to baggage claim from the gates, you're probably better off meeting in baggage claim. Since there are 20 baggage belts in United Baggage Claim, it's easiest to meet in the middle of them by the United Baggage Claim Office. There are bathrooms and a Starbucks by the Baggage Office. There is also an exit there where you can catch your limos.
Hope this helps!
Northsideguy