Quicktime will occasionally have problems with an H.264 movie in a QuickTime container and the decoding through Quicktime is not nearly as reliable as other players so you should never use Quicktime to render h.264 files.
There are several white papers you can read on h.264. As of today, it is the universal format and will playback on almost every modern device and with most media players.
Unless there are specific codec requirements and published instructions from a client you should always deliver an H.264 MP4 to a client. H.264 does not take a huge amount of processor power to decode the frames and put the information in a usable form. H.264 is an interframe MPEG format that does a very good job predicting the in-between frames and preserving luminance information with equals detail. There are several other codecs that will work just fine in an MP4 container.
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