There is no clear winner because you have left out an integral coefficient for compressing moving imagery - Bitrate. You not seeing a discernible difference between two movies with final rendered sizes of 11.1MB and 81MB, can be attributed to the difficulty (or ease, in this case)involved in compressing the video, for the CODEC.
I suggest that you look at the bitrate settings of the two movies to have a more appreciable understanding of what's happening in the background.
Lastly, I can't be certain, but I believe that all versions of AME, hitherto, use the Main Concept H264 encoder.
HTH
RoRK
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