They are very good combat and transport mounts. The males can attack, which allows them to gather thatch very efficiently. The females have no attack, but are a little faster, as there are no horns to weigh them down. There's also something satisfying about riding a moose. WHEEEEEEEEEE
Surprisingly good fighters, my rank 10 Mega is taking down carnos and argies on death island, and escaping with barely a scratch. I suggest upgrading health stamina and speed to maximize survivability.