I like Synthesia's inbuilt templates and wide variety of Avatars. It was very easy to set up. I use it to create explainer videos without a large production cost.
I like that it was pretty easy to figure out without a huge learning curve. I looked at a bunch of different options, and this one just looked the most natural to me. The people actually seem like they're talking instead of looking like obvious AI, and I think that makes a big difference.
Synthesia is super easy to utilize to create high quality videos quickly. Their customer service is exceptional when there is a problem with videos being generated or other issues.