You have to consider several things:
1) Avaliablity: Some requires advanced Tech, some requires special resourses, or even small wonders.
2) CIV attributes: Military CIV having higher chance of spawn GL
3) Defensive ability, also provide higher chance of survival. Imaging that it will be important when your unit become veteran or Elite, they will be the target of other civ.
4) Retreat ability. Faster unit can retreat from combat.
5) Offensive ability: the unit have to fight enough combats to be promoted to Elite.
1) Avaliablity: Some requires advanced Tech, some requires special resourses, or even small wonders.
2) CIV attributes: Military CIV having higher chance of spawn GL
3) Defensive ability, also provide higher chance of survival. Imaging that it will be important when your unit become veteran or Elite, they will be the target of other civ.
4) Retreat ability. Faster unit can retreat from combat.
5) Offensive ability: the unit have to fight enough combats to be promoted to Elite.
The UU is the only unit that can spawn you a GA. I think this is what you are thinking of. A UU will not be more superior in earning a higher status than a regular unit.
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