How good are Ballista Elephants? (AoE2)

Analysis of the Khmer Ballista Elephant, especially how they compare to the Elephant Archer and Scorpion.
1:15 Comparison to Elephant Archer
1:45 Comparison to Scorpion
2:50 Hidden attack bonuses
3:55 Upgrades
4:30 Are they cavalry or siege?
5:20 Imperial Age upgrades
7:15 vs Skirmishers & Archers
8:12 vs Halberdiers
9:10 vs Cavalry
11:28 vs Siege
12:40 Final thoughts
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Game: Age of Empires II Definitive Edition