At Simian (asset manager, web presentations, client review web app) we agree the usual h.264/AAC/faststart encoding is best as far as marketshare and playback support. Bit rate is an important factor as well. Longtail video has a good write up on all this stuff https://bit.ly/aUO6WW
If you’re interested in delivering video for web and mobile Simian stores your original native video file and also transcodes for mobile so high resolution videos playback fast on smartphones without managing/sending 2 separate files. We also use HTML5 to present on the iPad and Chrome (beta browser).
If anyone wants to dive in further tweet us @gosimian
Mike @ Simian