Mostly first person, and third person for pull situations or safer medding to see if something comes up from behind.
Reason for first person: Movement is intuitive, mouselook, strafing (afaik) only works in first person, because the other perspectives have no keybinds for it.
Also, I am used to being quite good at navigating around ego-shooter-levels in first person, so I feel it gives me a bit of an edge in messy add-situations.
And finally - I feel more immersed indeed.
Couple of reasons that add up, I suppose
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Slozem