To select the best animation company for an explainer video, one should thoroughly review potential companies' portfolios, testimonials from past clients, and online reviews from other sites to evaluate their experience, quality of work, and client satisfaction. It is also important to directly communicate with a company representative to assess their understanding of your needs and priorities, as well as their approach to customer service. Carefully checking multiple sources about an animation company can help ensure its expertise and ability to deliver an effective explainer video.