rotors_simulator vs hector_quadrotor

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Hi community,

I want to simulate a swarm of drones.

I am new to this field, and from hours of googling I have scoped down the packages to rotors_simulator and hector_quadrotor. But now I cannot find any comparisons between this two.

Which one would be better suited to be used to simulate a swarm of drones? Or if you normally use other options, please give me some hints.