There are various unit types and they have their advantages and disadvantages.


vehicles:
advantages:
- Good price / performance
- For the most part relatively low military points
- good Availability: buildable in normal bases, which occur often

cons:
- Need to drive around obstacles



helicopter:
advantages:
- Can fly over everything
- Strong weapons for a small construction price

cons:
- Can be built only in the rare helicopter bases
- High fuel consumption
- Weak armor



aircraft:
advantages:
- Very high speed
- Thanks to the high speed you can retire quickly, quickly intervene anywhere on the map and spy in enemy territory
- They hold a lot of bombardment due to their flares
- Can fly over everything
- Planes will be automatically repaired if they are nearby allied airbases

cons:
- buildable only in very rare occurring aircraft bases
- High construction costs
- High consumption of fuel per second (but they are faster, so the destination will reached earlier)
- Very high fuel consumption to fly to another map
- High military points

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