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Dark > Lightning = Water > Fire > Earth > Light
Fire is a worse version of Lightning,
Earth's HP gain doesn't matter if you just kill everything before it can attack (and is further negated if your squads have Oracles in them)
Light is only useful on Leader Units (but you're better off running Mercenary Leaders)
I'd like you to make a very important correction.
"Stat growth is better for classes in higher tiers, so you always want to promote your units as quickly as possible (at the lowest level) to have the best stat growth for the desired class."
This is not true. Tier does not affect growth rates.
That said, having Fire/Lightning/Dark) Soldiers for early-mid game might be better since you get access to Tier 3 a lot faster, even if they are being used as front line tanks, and a lvl 23 Dark Sentinel is better than a lvl 23 Earth Soldier. Later on you can either change their affinity to Earth or recruit Earth Fighters.
In short, my tip for tank units would be:
Early and mid game: use Fire/Lightning/Dark affinity Fighters so you can have Tier 3 units faster.
Late game (when Earth Soldiers have enough STR to become Sentinel/Knights): use Earth affinity if you want maximum HP.
Note: as @fort日 stated below, Earth is not really necessary even on Warlord.