An executive bus would be ideal for your group. It is designed for medium-sized groups, just under 20-25 people. Comfortable seats, air conditioning, Wi-Fi and a luggage compartment for things - all this makes the trip comfortable. We ordered https://coachamerica.com/destinations/chicago , and the drivers were experienced, they knew the routes in Chicago perfectly. The executive bus looks stylish, which is important for corporate events. A minibus would also be suitable, but it is smaller and will be cramped for such a number of employees. The executive bus will provide a comfortable ride, safety and the opportunity for everyone to enjoy the route together.