Quicktime movie and MPEG 4

What is the difference between exporting to Movie to Quicktime movie and Movie to MPEG 4?

To add to what Niel said...
A QT movie is any vaild compression format cobination in an MOV file container while a MPEG-4 movie is a particular sub-set of compression formats (i.e., MPEG4/AAC or H.264/AAC) in an MP4 file container. In the case of MPEG4/AAC and/or H.264/AAC compression formats, the data could be exactly the same but simply stored in alternative file containers.

any suggestions what I should use. I create home made movies using iMovie than export to quicktime. MPEG 4 or quicktime to movie.

The selection of a particular work flow usually depends on your work flow and/or the use/purpose of the export. For instance, if the file is to be emailed, you would probably want a small display, highly compressed H.264/AAC file which meets attacment file size limitation requirements. For posting to a web site, an MPEG4/AAC or H.264/AAC file using iPhone or iPod targeted dimensions are quite common with the MPEG-4 version being faster to compress and having a wider range of compatibility with older systems but normally requiring 2.0 to 2.5 times as great video data rate to achieve quality equivalents of the H.264 version. Specialty clips could be exported at any compatible dimensions, to include HD, and in any compression format combination best suited to your particular work and/or follow-on processing requirements. In short, the "Movie to QuickTime Movie" option provides a wider range of possible compression formats but if they are not needed, then the "Movie to MPEG-4" offers an general purpose set of options that will normally meet the needs of an average user on a daily basis.

Using QuickTime Movie puts it in a mov container while keeping its original format. The MPEG 4 option actually changes the format.

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