If your looking to have commercial video services done then it's important you hire someone willing to capture and deliver on your vision + add to it.
Creative work such as this requires careful planning and a certain amount of desk work before one camera gets turned on. You and the agency must come to terms with the goal of the project and layout an action plan.
The company you choose should be on top of creative trends and technological advances.
Hire someone that you feel is as interested as you in producing amazing content.
Hire someone that's passionate and loves what they do, because honestly this labor is hard if you don't love it the video will reflect it.