Spiegel

Enel is very good at adapting to disadvantageous situations and exceeding them. Luffy is rubber? Since electricity doesn't work, turn staff into a trident and heat it up with electricity to burn him.

Enel is also a master at using his kenbunshoku haki, even if Aokiji were to fight him at close range Enel would still have some advantage. But Aokiji has lots of experience with logia users and his fight with Akainu and the fact that they were almost evenly matched is testament to his level of strength and skill. It'd definitely be a close fight. Enel to me seems to have a slight upper hand and could possibly win it.

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*Ex-Kakashi87*