Uber XL holds 6 and I would not expect much luggage. Most are Toyota Highlander or like although a minivan or slightly larger suv is possible but more of very unlikely. 6 alone plus driver in a highlander is tight with nothing else…
For that many you will need a suburban or Escalade and that might be tight depending on what luggage consists of. A regular Uber and one XL should work however which may still be cheaper then a car service? Possible for 2 regular Ubers if it’s carryons or shared bags.