Renekton: Sorcery vs Fury mastery

If you check masteries of any of the top renekton players you will see they don't ever take sorcery (Increases ability and spell damage by 2%) over fury (Increases champion attack speed by 4%), so I had to test it by myself, turns out, as i expected, the total damage output in a full combo is higher with sorcery on, plus it scales with the more AD you have (2% increase damage on abilities), I prefer sorcery over fury, but this really depends on the build you are going, but for most cases sorcery goes well with renekton as he is mostly dependant on abilities rather than basic attacks. If you know the reason (besides probably better cs) people take fury over sorcery let me know.