h264 is still dominant by a long shot and the most widely used today. I can't speak for server/streaming services but on the ground where video editing takes pl

h264 is still dominant by a long shot and the most widely used today. I can't speak for server/streaming services but on the ground where video editing takes place, it's the winner. h265 was supposed to replaced it but things leapfrogged and hardware acceleration didn't come fast enough. At this point I think most of the industry is looking at what is next. About a year ago I started seeing more h265 support in cameras, but it's rare I get an h265 file from editors/productions, ever. I'm reading more and more about AV1 and MPEG-5 being next in line. mp4, but there isn't really a "best" container. AVI isn't very common though.