Every company on this list can produce a genuinely good-looking video. That's not in question. What separates them is what happens after it's uploaded.
Video production companies can make something look beautiful. A YouTube agency should make something people actually watch, and keep watching, week after week.
Every company on this list can help you make a video. Only one of them will help you build a channel.
Video is one of the few investments that keeps paying off long after the shoot wraps, provided it's built with a plan behind it.
If your views and subscribers have plateaued despite decent production quality, you need a YouTube strategist first and a production team second.
Video isn't a nice to have anymore, it's the main way most audiences decide whether to trust a business.