I am creating a series of online training videos for schools and libraries to educate them about a webtool they have recently purchased. The videos are screencasts shot with camtasia and they are between 10 - 15 minutes in length. My question is which format is more suitable for publishing this media? I know I can obtain a better quality/size ration with MP4 but I know that there used to be compatibility issues. Is that till the case? Which format will be most well-suited to the target audience and please briefly explain to me why.
I can obtain an acceptable level of quality while maitaining a ratio of about 1 - 1.5 MBs per minute of video at 800x600 in both formats. So really the question is now which one should I be publishing in to accomodate the most users?
I thank you for your input.