I like both as there are limitations in terms of realism for both perspectives, and both have veracity in a serious tactical realism game. 'First person' is a bit of a misnomer -- as it's really not first person; those aren't your hands on the screen, and just as many others get more of a sense of immersion from one perspective as the other...
Functionally we don't have the FOV or distance vision in games we have in the real world -- regardless of game perspective: you can turn your eyes and back, and notice things far into your peripheral vision in the real world in a fraction of the tim