For just getting around Paris, I would recommend taxis, They will take up to 7 people, there is a 4€ charge for the 5th and each additional passenger. Taxis have access to the bus lanes which will get you to your destination much faster during traffic than can the VTCs; Uber or Lecab. Taxi G7 has an app just like Ubers.
I occasionally use Uber and the half dozen or so cars I have ridden in would not accommodate 5 passengers. I am sure that Uber has cars for 5 if you specify when ordering.
I do not, nor does anyone I know, use Lecab.