Dual Monitor Mount vs. Two Single Arms? Gas Spring or Pole?

I’m looking to mount two 27-inch monitors and trying to decide between a single dual-monitor mount or two separate single arms. Are there any major advantages to one setup over the other in terms of flexibility, stability, or desk space?

Also, for those who’ve used both—do you prefer gas spring arms or pole-mounted ones? I want something sturdy but also easy to adjust.

Would love to hear your experiences!