Unit size does not make it harder or easier to control cities. If two units of Leves are enough on huge to get the maximum 80% order bonus, then two units of Leves are enough on normal unit size to get the same 80% bonus.
Huge has the advantage that you can limit population growth somewhat easier (by recruiting), but as a downside, you have to be very careful with recruiting in smaller settlements, else they will end up as ghost towns.
There is little point in aiming for green faces - you want to earn all the money you can get. The downside to having yellow and blue happiness faces is that there is a higher chance of rebels spawning in such provinces.
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