Calorie count on device vs. calculated in upload

I have not been uploading rides for a while as I was quite annoyed with the difference in calories burned on my Garmin edge 800 vs. what actually shows up in my uploaded ride. The number uploaded its much higher than the one on my device and although it's tempting to just go with the highest :) it's still an overall factor of uncertainty in my training.

However, I miss a lot of the other features on the site and would really like to use it in my training again, if anyone could explain the difference in calculations and why I should trust the one the upload over my device. 



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