Xtron pf75aa4a?

I'm looking at a few different models that will hopefully play nice with my 2004 Audi Allroad and happened across this model that says it uses Android 5.1, however it seems like some of these might just be "skinned" 4.4.4 to look like 5.1. Does anyone have any experience with the XTroon units and whether this is a real 5.1 unit?

I'm also looking at one of these two Joying units,
JY-UQ130
JY-UQ124U

Thanks for the help!

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