Which Motors?

I am building a F450 with Aimdroix aluminum arms so it will be a F550. Intentions is to mount a GoPro on a brushless gimbal. The FC is Pixhawk. I have two motors to choose from. Either the Sunnysky V3508-20 KV:580 or the Sunnysky X3108S-19 KV:720. Which of the two motors would be my best choice?
 



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