After some basic research, I divided the UUs into the following categories
- Immortal, Samurai, Panzer
powerful units great for the conquests in ancient/middle/modern times. - Cossack, Rider, War Elephant
speedy attacking units, great for conquest in the middle age (perfect for the GA) - Jaguar Warrior, Mounted Warrior, Impi, War Chariot
scouts with defence/attack, great for the early exploration - Man-o-war, F-15
naval/air units - Musketeer, Hoplite, Legion, Bowman
a mixture of the rest of the UUs
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Here I wanted to post multiple polls to rank the UUs more precisely, but fount out it was impossible.