Good platform for a low latency h264 encoder?

[pier.cvn at libero.it]

Hi,
I would like to develop an application that used a sub-frame h264 encoder with gstreamer. I was thinking about simply using a RPi, however I see that the majority of this list is focused on iMX.6 or other platforms instead, that are more expensive. My two possible inputs are a CSI camera and an HDMI input, and both need to be implemented in similar ways, (eg, the imx6 doesn't have, for example, a direct HDMI input interface).
Is there any reason I'm missing for this preference towards imx6?

Thank you.
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