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With which civ are you more than willing to build a Castle in Early Castle Age and switch to the UU rather than going for the generic unit?
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With which civ you are more likely to switch into the Elite form of the UU leaving behind a bunch of Castle Age generic units?
Exceptions:
- Sicilians - because their UU can be built from Donjons also, which can be built in Feudal Age.
- Secondary UUs - Genitours, Condottierri, Longboats, Slingers - since they do not require you to build a Castle first, which is the point of the topic
- UU unlocked by another tech - Flaming Camels, Imperial Camels, Imperial Skirmisher
- Cuman Mercenary Kipchaks - inconsistent
Allowed:
- Konniks from Kreposts
- Frank Castles
My picks would be the Mangudai in Castle Age and Elite Longbowmen in Imperial Age.
Edit: It makes sense that all units on the 1st sublist are on the 2nd sublist. That is, I will rush to get Mangudai and then upgrade to Elite Mangudai. On the other hand, I may not rush to get Longbowmen out, but I can leave my army of Crossbowmen and rather switch to Elite Longbowmen.
Choice between Arbalester and Foot Archer UU is easy since Arbalester upgrade is cheap, but you have to keep in mind in late Castle Age if you want to stick to Knights into Paladins or switch to Elite Leitis, since affording both upgrades will backfire.