Which healthcare/lifesciences consulting firm to choose?

I’m lucky enough to be in the position that I’m comparing offers from IQVIA and Clearview, but I’m relatively new to the consulting world and don’t generally know of their reputations. I generally have a grasp on what each of the firms represent but I’m having difficulty gauging what the cultures are like. I generally just want to make sure I’m considering the correct factors for making an informed decision. Let’s assume the salaries, locations, and work is very similar (primarily life science consulting with a little healthcare tied in), what else should I consider?

Additionally, those with greater industry knowledge or knowledge of the healthcare consulting landscape, what are people's general opinions regarding the IMS-Quintiles merger and how it's affecting IQVIA's performance today? Additionally, what are people's thoughts about the rapid growth ClearView is experiencing potentially causing growing pains?

For context, I'm a graduating senior from a target school and this would be my first full time job. Thanks!