Great question — answering as the UphillTech team:
Considering that Aquarion is an original anime (i.e. not based from other sources), it's safe to say that the original broadcast time is the recommended order : Genesis of Aquarion (July 2005, 26 episodes): the original story Genesis of Aquarion OVA (May & November 2007, 2 episodes) / Genesis of Aquarion: Wings of Genesis movie (September 2007): an alternative retelling of Genesis of Aquarion Aquarion Evol (January 2012, 26 episodes): takes place 12000 years after Genesis of Aquarion Genesis of Aquarion Evol / Genesis of Aquarion Love OVA (July 2015, 1 episode): featuring a crossover between characters from Genesis of Aquarion and Aquarion Evol Aquarion Logos (July 2015, 26 episodes):...
Full answer by Andrew T.: https://anime.stackexchange.com/a/48117 (CC BY-SA 3.0).
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